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Pascal/Delphi Source File  |  1995-03-03  |  4KB  |  109 lines
  1. {
  2. > I was wondering if there's anybody out there who can explain the
  3. > Voxel-technique to me, or who can recommend a book about the subject.
  4.  
  5. I have a fairly good voxel-source.
  6. This one is not mine. And I forgot who made it.
  7. }
  8.  
  9. program voxel;
  10. uses crt;
  11. type lrgarr=array[0..65534] of byte;
  12. const
  13.  pal:array[1..384] of byte=(
  14.   0,0,0,48,48,48,1,0,43,1,3,43,2,5,44,2,7,44,3,9,45,4,11,46,5,13,47,6,15,48,
  15.   7,17,49,8,19,50,9,21,51,10,22,52,11,24,52,12,26,54,13,28,54,14,30,56,15,32,
  16.   56,16,34,58,17,34,58,17,36,58,18,38,60,19,40,60,20,42,62,21,44,62,10,31,0,
  17.   11,31,0,11,31,1,11,32,1,12,32,1,12,32,2,12,33,2,13,33,2,14,33,3,15,33,3,15,
  18.   34,3,15,34,4,15,35,4,16,35,4,16,35,5,16,36,5,17,36,5,17,36,6,18,37,6,18,38,
  19.   7,19,38,8,20,39,8,20,40,9,21,40,10,22,41,10,22,42,11,23,42,12,24,43,12,24,
  20.   44,13,25,44,14,25,45,14,26,46,15,27,46,16,27,47,17,28,47,18,28,48,19,29,49,
  21.   19,30,49,20,30,50,21,31,51,21,32,51,22,32,52,23,33,53,23,34,53,24,34,54,25,
  22.   35,55,25,36,55,26,36,56,27,37,57,27,38,57,27,39,57,27,41,57,27,42,57,27,43,
  23.   57,27,44,57,27,45,57,27,46,57,27,47,57,27,49,57,27,50,57,27,51,57,27,52,57,
  24.   27,53,57,27,55,57,27,56,57,27,57,57,27,58,57,27,58,57,26,58,57,25,58,57,24,
  25.   58,56,23,58,55,22,58,54,20,58,53,19,58,51,18,58,50,17,58,50,16,58,49,15,58,
  26.   48,14,58,47,13,58,46,12,58,45,11,58,44,11,58,44,10,58,43,10,58,42,9,57,41,
  27.   8,57,40,8,56,39,7,56,38,6,55,37,5,55,35,4,54,33,4,54,31,2,32,32,32,63,63,63,
  28.   63,63,63,63,63,63,63,63,63,48,48,48,63,63,63,63,63,63);
  29.  
  30. var
  31.   mp,scr:^lrgarr;
  32.   rng:array[0..320] of byte;
  33.   dir,i,x,y:integer;
  34.  
  35. function ncol(mc,n,dvd:integer):integer;
  36. var loc:integer;
  37. begin
  38.   loc:=(mc+n-random(2*n)) div dvd; ncol:=loc;
  39.   if loc>250 then ncol:=250; if loc<5 then ncol:=5
  40. end;
  41.  
  42. procedure plasma(x1,y1,x2,y2:word);
  43. var xn,yn,dxy,p1,p2,p3,p4:word;
  44. begin
  45.   if (x2-x1<2) and (y2-y1<2) then exit;
  46.   p1:=mp^[256*y1+x1]; p2:=mp^[256*y2+x1]; p3:=mp^[256*y1+x2];
  47.   p4:=mp^[256*y2+x2]; xn:=(x2+x1) shr 1; yn:=(y2+y1) shr 1;
  48.   dxy:=5*(x2-x1+y2-y1) div 3;
  49.   if mp^[256*y1+xn]=0 then mp^[256*y1+xn]:=ncol(p1+p3,dxy,2);
  50.   if mp^[256*yn+x1]=0 then mp^[256*yn+x1]:=ncol(p1+p2,dxy,2);
  51.   if mp^[256*yn+x2]=0 then mp^[256*yn+x2]:=ncol(p3+p4,dxy,2);
  52.   if mp^[256*y2+xn]=0 then mp^[256*y2+xn]:=ncol(p2+p4,dxy,2);
  53.   mp^[256*yn+xn]:=ncol(p1+p2+p3+p4,dxy,4);
  54.   plasma(x1,y1,xn,yn); plasma(xn,y1,x2,yn);
  55.   plasma(x1,yn,xn,y2); plasma(xn,yn,x2,y2);
  56. end;
  57.  
  58. procedure draw(xp,yp,dir:integer);
  59. var z,zobs,ix,iy,iy1,iyp,ixp,x,y,s,csf,snf,mpc,i,j:integer;
  60. begin
  61.   fillchar(rng,sizeof(rng),200); zobs:=100+mp^[256*yp+xp];
  62.   csf:=round(256*cos(dir/180*pi)); snf:=round(256*sin(dir/180*pi));
  63.   fillchar(scr^,64000,0);
  64.   for iy:=yp to yp+55 do begin
  65.     iy1:=1+2*(iy-yp); s:=4+300 div iy1;
  66.     for ix:=xp+yp-iy to xp-yp+iy do begin
  67.       ixp:=xp+((ix-xp)*csf+(iy-yp)*snf) shr 8;
  68.       iyp:=yp+((iy-yp)*csf-(ix-xp)*snf) shr 8;
  69.       x:=160+360*(ix-xp) div iy1;
  70.       if (x>=0) and (x+s<=318) then begin
  71.         z:=mp^[iyp shl 8+ixp]; mpc:=z shr 1;
  72.         if z<47 then z:=46;  y:=100+(zobs-z)*30 div iy1;
  73.         if (y<=199) and (y>=0) then for j:=x to x+s do begin
  74.           for i:=y to rng[j] do scr^[320*i+j]:=mpc;
  75.           if y<rng[j] then rng[j]:=y
  76.         end;
  77.       end;
  78.     end;
  79.   end;
  80.   move(scr^,mem[$a000:0],64000);
  81. end;
  82.  
  83. begin
  84.   writeln('creating landscape...');
  85.   randomize; x:=0; y:=0; dir:=0; new(mp); fillchar(mp^,65535,0);
  86.   new(scr); mp^[$0000]:=128; plasma(0,0,256,256);
  87.   asm xor ax,ax; mov al,$13; int $10; end;
  88.   port[$3c8]:=0; for i:=1 to 384 do port[$3c9]:=pal[i];
  89.   repeat
  90.     dir:=dir mod 360;
  91.     draw(x,y,dir);
  92.     case readkey of
  93.       #0:case readkey of
  94.         #75:dec(dir,10);
  95.         #77:inc(dir,10);
  96.         #72:begin
  97.           y:=y+round(5*cos(dir/180*pi));
  98.           x:=x+round(5*sin(dir/180*pi));
  99.         end;
  100.         #80:begin
  101.           y:=y-round(5*cos(dir/180*pi));
  102.           x:=x-round(5*sin(dir/180*pi));
  103.         end;
  104.       end;
  105.       #27:begin asm xor ax,ax; mov al,$3; int $10; end; halt end
  106.     end
  107.   until false;
  108. end.
  109.