| 0,0 → 1,226 |
|---|
| ;PUTPIXEL -> RGBPIXEL |
| |
| locals |
| n dd ? |
| d_x dd ? |
| d_y dd ? |
| sx dd ? ;ширина буфера в пикселях |
| pp_inc_1 dd ? |
| pp_inc_2 dd ? |
| a dd ? ;register int |
| if TGL_FEATURE_RENDER_BITS eq 24 |
| r dd ? ;register unsigned int |
| g dd ? |
| b dd ? |
| end if |
| if INTERP_Z eq 1 |
| pz dd ? ;register unsigned short * |
| zinc dd ? |
| z dd ? ;register int |
| zz dd ? |
| end if |
| endl |
| pushad |
| |
| mov eax,[p1] |
| mov ebx,[p2] |
| mov ecx,[ebx+offs_zbup_y] |
| cmp [eax+offs_zbup_y], ecx ;if (p1.y > p2.y) |
| jg @f |
| jl .end_0 ;if (p1.y != p2.y) |
| mov ecx,[ebx+offs_zbup_x] |
| cmp [eax+offs_zbup_x], ecx ;if (p1.x > p2.x) |
| jle .end_0 ;if (p1.x <= p2.x) |
| @@: ;if (p1.y > p2.y || (p1.y == p2.y && p1.x > p2.x)) |
| mov [p1],ebx |
| mov [p2],eax |
| .end_0: |
| |
| mov eax,[zb] |
| mov edx,[eax+offs_zbuf_xsize] |
| mov [sx],edx |
| mov ecx,[p1] |
| mov edi,[eax+offs_zbuf_linesize] |
| imul edi,[ecx+offs_zbup_y] |
| mov edx,[ecx+offs_zbup_x] |
| imul edx,PSZB |
| add edi,edx |
| add edi,[eax+offs_zbuf_pbuf] ;edi = (zb.pbuf + zb.linesize*p1.y + p1.x*PSZB) |
| if INTERP_Z eq 1 |
| mov edx,[ecx+offs_zbup_y] |
| imul edx,[sx] |
| add edx,[ecx+offs_zbup_x] |
| add edx,[eax+offs_zbuf_zbuf] |
| mov [pz],edx ;pz = zb.zbuf + (p1.y*sx + p1.x) |
| mov edx,[ecx+offs_zbup_z] |
| mov [z],edx ;z = p1.z |
| end if |
| |
| mov ebx,[p2] |
| mov eax,[ebx+offs_zbup_x] |
| sub eax,[ecx+offs_zbup_x] |
| mov [d_x],eax ;d_x = p2.x - p1.x |
| mov eax,[ebx+offs_zbup_y] |
| sub eax,[ecx+offs_zbup_y] |
| mov [d_y],eax ;d_y = p2.y - p1.y |
| if TGL_FEATURE_RENDER_BITS eq 24 |
| ; for 24 bits, we store the colors in different variables |
| mov eax,[ebx+offs_zbup_r] |
| shr eax,8 |
| mov [r],eax ;r = p2.r >> 8 |
| mov eax,[ebx+offs_zbup_g] |
| shr eax,8 |
| mov [g],eax ;g = p2.g >> 8 |
| mov eax,[ebx+offs_zbup_b] |
| shr eax,8 |
| mov [b],eax ;b = p2.b >> 8 |
| end if |
| |
| macro RGBPIXEL |
| { |
| if TGL_FEATURE_RENDER_BITS eq 24 |
| mov eax,[r] |
| mov byte[edi],al |
| mov eax,[g] |
| mov byte[edi+1],al |
| mov eax,[b] |
| mov byte[edi+2],al |
| ;;; else |
| ;;; mov eax,[color] |
| ;;; mov [edi],eax |
| end if |
| } |
| |
| macro PUTPIXEL |
| { |
| if INTERP_Z eq 1 |
| local .end_0 |
| mov eax,[z] |
| shr eax, ZB_POINT_Z_FRAC_BITS |
| mov [zz],eax |
| cmp eax,[pz] |
| jl .end_0 |
| RGBPIXEL |
| mov eax,dword[zz] |
| mov [pz],eax |
| .end_0: |
| else ; INTERP_Z |
| RGBPIXEL |
| end if ; INTERP_Z |
| } |
| |
| macro DRAWLINE d_x,d_y,inc_1,inc_2 |
| { |
| mov eax,d_x |
| mov [n],eax |
| if INTERP_Z eq 1 |
| mov ebx,[p1] |
| mov eax,[p2] |
| mov eax,[eax+offs_zbup_z] |
| sub eax,[ebx+offs_zbup_z] |
| xor edx,edx |
| div dword[n] |
| mov [zinc],eax ;zinc=(p2.z-p1.z)/n |
| end if |
| shl dword d_y,1 |
| mov eax, d_y |
| sub eax, d_x |
| mov [a],eax ;a=2*d_y-d_x |
| shl dword d_x,1 |
| mov eax, d_y |
| sub d_x,eax |
| mov eax,inc_1 |
| imul eax,PSZB |
| mov [pp_inc_1],eax ;pp_inc_1 = inc_1*PSZB |
| mov eax,inc_2 |
| imul eax,PSZB |
| mov [pp_inc_2],eax ;pp_inc_2 = inc_2*PSZB |
| |
| local .do_cycle |
| local .els_0 |
| local .end_0 |
| |
| align 4 |
| .do_cycle: |
| |
| PUTPIXEL |
| if INTERP_Z eq 1 |
| mov eax,[zinc] |
| add [z],eax |
| end if |
| |
| cmp dword[a],0 |
| jle .els_0 |
| add edi,[pp_inc_1] |
| if INTERP_Z eq 1 |
| mov eax,inc_1 |
| add [pz],eax |
| end if |
| mov eax,d_x |
| sub [a],eax |
| jmp .end_0 |
| |
| .els_0: |
| add edi,[pp_inc_2] |
| if INTERP_Z eq 1 |
| mov eax,inc_2 |
| add [pz],eax |
| end if |
| mov eax,d_y |
| add [a],eax |
| |
| .end_0: |
| dec dword[n] |
| cmp dword[n],0 |
| jge .do_cycle |
| } |
| |
| ; fin macro |
| |
| mov eax,[d_x] |
| cmp eax,0 |
| jne .els_0 |
| cmp dword[d_y],0 |
| jne .els_0 |
| ;if (d_x==0 && d_y==0) |
| PUTPIXEL |
| jmp .end_2 |
| .els_0: |
| cmp eax,0 |
| jle .els_3 |
| ;if (d_x > 0) |
| mov esi,[sx] |
| inc esi |
| cmp eax,[d_y] |
| jl .els_2 |
| ;if (d_x >= d_y) |
| DRAWLINE [d_x], [d_y], esi, 1 |
| jmp .end_2 |
| .els_2: |
| DRAWLINE [d_y], [d_x], esi, [sx] |
| jmp .end_2 |
| .els_3: |
| xor eax,eax |
| sub eax,[d_x] |
| mov [d_x],eax |
| mov esi,[sx] |
| dec esi |
| cmp eax,[d_y] |
| jl .els_4 |
| ;if (d_x >= d_y) |
| DRAWLINE [d_x], [d_y], esi, -1 |
| jmp .end_2 |
| .els_4: |
| DRAWLINE [d_y], [d_x], esi, [sx] |
| .end_2: |
| |
| popad |
| ret |
| endp |
| |
| restore INTERP_Z |
| |
| ; internal defines |
| purge DRAWLINE |
| purge PUTPIXEL |
| purge RGBPIXEL |