pico-8 cartridge // http://www.pico-8.com
version 32
__lua__
-- game code

-- player states enum
walk = 0
stand = 1
fly = 2
glide = 3

function init_world()
  player = {
    x = 60,
    y = 112,
    vy = 0,
    flipx = false,
    spr = 0,
    state = stand,
    time = 0
  }
end

function _init()
  -- disable btnp autorepeat
  poke(0x5f5c, 255)
  
  -- set peach as bg color
  -- instead of black
  palt(black, false)
  palt(peach, true)

  init_world()
end

function _update()
  update_player()
end

function set_state(state)
  if (player.state == state) return
  player.state = state
  player.time = 0
end

function _draw()
  cls(12)
  camera_x = mid(0, 896, player.x - 64)
  camera(camera_x, 0)
  draw_bg()
  draw_player()
  camera(0, 0)
  print_ctr("b o r b",8,yellow)
  --print(player.state.." "..player.time)
end

function draw_bg()
  map(0, 0, 0, 0, 128, 16)
end

function update_player()
  if (btnp(🅾️)) then
    player.vy = -5
    set_state(fly)
  end

  dx = bool2int(btn(1)) - bool2int(btn(0))
  if (dx != 0) then
    if player.state >= fly then
      dx *= 2
    end
    player.x += dx
    player.flipx = dx < 0
    if player.state == stand then
      set_state(walk)
    end
  elseif player.state == walk then
      set_state(stand)
  end
  player.y += player.vy
  player.vy += 0.5
  if player.vy > 0 and btn(🅾️) and player.state >= fly then
    if player.state == fly then
      set_state(glide)
    end
    player.vy = 0.2
  end
  if (player.y > 112) then
    player.y = 112
    player.vy = 0
    if player.state >= fly then
      set_state(stand)
    end
  end
  
  terrain = mget((player.x+4)/8,(player.y+8)/8)
  if player.vy > 0 and fget(terrain, 0) then
    player.y = ((player.y + 1)\ 8) * 8
    player.vy = 0
    if player.state >= fly then
      set_state(stand)
    end
  end
    
  player.x = mid(0, player.x, 1016)

  -- update sprite  
  if player.state == stand then
    player.spr = 1
  elseif player.state == glide then
    if player.time % 16 >= 14 then
      player.spr = 1
    else
      player.spr = 3
    end
  elseif player.state == walk then
    player.spr = (player.time / 2) % 2 + 1
  else
    player.spr = (player.time / 2) % 3 + 1
  end
  
  player.time += 1
end

function draw_player()
  spr(player.spr,player.x,player.y,1,1,player.flipx)
end

-->8
-- library

black = 0
dark_blue = 1
dark_purple = 2
dark_green = 3
brown = 4
dark_gray = 5
light_gray = 6
white = 7
red = 8
orange = 9
yellow = 10
green = 11
blue = 12
indigo = 13
pink = 14
peach = 15

function print_ctr(s,y,c)
  print(s,64 - #s * 2,y,c)
end

function bool2int(b)
  return b and 1 or 0
end
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