procedure dobump; {Now u guess what this one does..hehehe}
var difx, {The X axis difference}
  dify, {The Y axis difference}
  col:byte; {Used in many points..}
  l1:integer; {General use}
begin
 lx:=160; {The starting position of the light source}
 ly:=100; {>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>}
 l1:=0;
 repeat
  inc(l1);
  lx:=round(cos(l1/13)*66+160);
  ly:=round(sin(l1/23)*66+100);
  {^^^^ those two make sure the light moves in a nice round path..}
  for x:=1 to 319 do
   for y:=1 to 190 do begin
   {This is where the important stuff is done}
   {Here we will light the point x,y if lx,ly is the light position}

    vlx:=x-lx; {Calculate the L vector}
    vly:=y-ly; {>>>>>>>>>>>>>>>>>>>>>>}

    if (vlx<130) and (vlx>-130) and (vly>-130) and (vly<130 ) then begin
    {This is some stupid way to gain speed.. if the light vector is too
    far away from the point we want to light then don't bother..it
    will probably get no light..}
     nx:=mem[vaddr:x+y*320+1]-mem[vaddr:x+y*320-1];
     ny:=mem[vaddr:x+(y+1)*320]-mem[vaddr:x+(y-1)*320];