Pico-8 Raycaster demo

rayzzz.p8

pico-8 cartridge // http://www.pico-8.com
version 8
__lua__
-- raycaster demo
-- by @powersaurus
-- based heavily on http://lodev.org/cgtutor/raycasting.html
-- and http://lodev.org/cgtutor/raycasting2.html
-- and inspired by the work of @matthughson
-- thanks for advice from @kometbomb and @doyousketch2

-- the numbers mean nothing yet,
-- only important thing is non-zero
-- is solid wall
world={
{7,3,3,4,5,6,7,8,7,4,7},
{6,0,0,0,0,0,0,0,0,0,10},
{7,0,0,0,0,0,0,0,0,0,7},
{6,0,0,0,0,0,0,0,0,0,7},
{8,0,0,0,0,9,13,0,0,0,7},
{6,0,0,0,0,9,13,0,0,0,7},
{4,0,0,0,0,0,0,0,0,0,7},
{3,0,0,0,0,0,0,0,0,0,7},
{2,0,0,0,0,0,0,0,0,0,9},
{8,3,3,4,5,6,7,7,7,8,7}
}

frames=0
function calculate_fps(now)
 frames+=1
 local newnow=flr(now)
 if (newnow!=lastclock) then
  fps=frames
  frames=0
  lastclock=newnow
 end
end

function _init()
 player={
  a=180,
  pos={x=5,y=8},
  dr={x=-1,y=0}, -- looking west
  cam={0,0.66}
 }
 timer=0
 dist_table={}
  
 for y=0,128 do
  dist_table[y]=128/(2*y-128)
 end

 _draw=draw
 _update=update

end

function turnplayer(player,ar)
 player.a+=ar
 if player.a>359 then
  player.a-=359
 end
 local r=player.a/360
 local olddrx=player.dr.x
  
 player.dr.x=cos(r)
 player.dr.y=-sin(r)

 local r2=ar/360
 local oldplanex=player.cam[1]
  
 player.cam[1]=oldplanex*cos(r2)+
  player.cam[2]*sin(r2)
 player.cam[2]=-oldplanex*sin(r2)+
  player.cam[2]*cos(r2)
end

function update()
 timer+=1
 
 if btn(0) then
  turnplayer(player,3)
 end
 if btn(1) then
  turnplayer(player,-3)
 end
 local sp=0.16
 if btn(2) then
  local movex=flr(player.pos.x+player.dr.x*sp)
  local movey=flr(player.pos.y+player.dr.y*sp)
  
  if (world[flr(player.pos.y)][movex]==0) player.pos.x+=player.dr.x*sp
  if (world[movey][flr(player.pos.x)]==0) player.pos.y+=player.dr.y*sp
 end
 if btn(3) then
  local movex=flr(player.pos.x-player.dr.x*sp)
  local movey=flr(player.pos.y-player.dr.y*sp)
  
  if (world[flr(player.pos.y)][movex]==0) player.pos.x-=player.dr.x*sp
  if (world[movey][flr(player.pos.x)]==0) player.pos.y-=player.dr.y*sp
 end
end

function draw()
 cls()

 calculate_fps(time())
 timer+=1

 rectfill(0,64,128,128,1)

 local minwalldist=1000
 local west=0
 
 local check=0
 for x=0,127 do 
  local camx=2*x/128 -1
  local rayx=player.pos.x
  local rayy=player.pos.y
  
  local raydirx=
   player.dr.x+player.cam[1]*camx
  local raydiry=
   player.dr.y+player.cam[2]*camx
   
  local mapx=flr(rayx)
  local mapy=flr(rayy)

  
  local ddx=sqrt(
   1+(raydiry*raydiry)/(raydirx*raydirx)
  )
  
  local ddy=sqrt(
   1+(raydirx*raydirx)/(raydiry*raydiry)
  )
  
  if abs(raydirx)<0.01 then
   ddx=100
  end
  if abs(raydiry)<0.01 then
   ddy=100
  end
  
  local hit=0
  local side=0
  local stepx=0
  local stepy=0
  local sidedistx=0
  local sidedisty=0
  
  if raydirx<0 then
   stepx=-1 
   sidedistx=(rayx-mapx)*ddx 
  elseif raydirx>0 then
   stepx=1  
   sidedistx=(mapx+1-rayx)*ddx 
  else
   stepx=0
   sidedistx=10000
  end
  
  if raydiry<0 then
   stepy=-1
   sidedisty=(rayy-mapy)*ddy
  elseif raydiry>0 then
   stepy=1  
   sidedisty=(mapy+1-rayy)*ddy
  else
   stepy=0
   sidedisty=10000
  end
  
  while hit==0 do
   if sidedistx<sidedisty then
    sidedistx+=ddx
    mapx+=stepx
    side=0
   else
	   sidedisty+=ddy
    mapy+=stepy
    side=1
   end
   
   if world[mapy][mapx]>0 then
    hit=1
   end
  end
  
  local perpwalldist=0
  
  if side==0 then
   perpwalldist=(mapx-rayx+
    (1-stepx)/2)/raydirx
  else
   perpwalldist=(mapy-rayy+
    (1-stepy)/2)/raydiry
  end
  
  last=perpwalldist
  
  local lheight=flr(128/perpwalldist)
  local dstart=-lheight/2+64
  local dend=lheight/2+64
  
  -- hack for being very close
  -- to the wall. doesn't quite
  -- work
  if dstart>=dend then
   dstart=0
   dend=128
  end
  
  local wallx=0
  if side==0 then
   wallx=rayy+perpwalldist*raydiry
  else
   wallx=rayx+perpwalldist*raydirx 
  end
  wallx-=flr(wallx)
  
  local texx=flr(wallx*16)
  if (side==0 and raydirx>0) texx=16-texx-1
  if (side==1 and raydiry<0) texx=16-texx-1
  
  if minwalldist<perpwalldist then
   minwalldist=perpwalldist
  end
-- draw vertical wall line
  sspr(texx,0,1,16,x,dstart,1,dend-dstart+1)
  
  local floorxwall=0
  local floorywall=0
  -- side=0 -> y-axis aligned
  -- side=1 -> x-axis aligned
  if side==0 and raydirx>0 then
   -- east
   floorxwall=mapx
   floorywall=mapy+wallx
  elseif side==0 and raydirx<0 then
   -- west
   floorxwall=mapx+1
   floorywall=mapy+wallx
   west+=1
  elseif side==1 and raydiry>0 then
   -- south
   floorxwall=mapx+wallx
   floorywall=mapy
  else
   -- north
   floorxwall=mapx+wallx
   floorywall=mapy+1
  end
  
  local distplayer=0
  local h=128
  
  if (dend<0) dend=h
  
  -- draw every other vertical line
  if x%2==0 then
  local skip=-1
  local bar=1
  local y=h-check
  
  while y>dend+10 do
   if y%2==check then
   local curdist=dist_table[y]
   local weight=curdist/perpwalldist
   
   local oneminusw=1-weight

   local cfloorx=weight*floorxwall+(oneminusw)*player.pos.x
   local cfloory=weight*floorywall+(oneminusw)*player.pos.y
   
   local floortexx=16+cfloorx*16%16
   local floortexy=cfloory*16%16
   
   -- dither band
   if y<94 then
    pset(x,y,sget(floortexx,floortexy))
    floortexx=16+(floortexx+1)%16
    pset(x+1,y,sget(floortexx,floortexy))
   else -- line band with 'guessed' colour
    line(x,y,x+3,y,sget(floortexx,floortexy))
   end
   end
   y+=skip
  end
  if check==0 then
   check=1
  else
   check=0
  end
  end
 end
 print(fps,2,2,7)
 
 print("cpu: "..stat(1),2,10,7)
end
__gfx__
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__music__
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