ludic/examples/scenes.ludic

# ⚠️ NOT YET IMPLEMENTED by the self-hosted compiler. `scene` / `layer` /
# `on enter` / `on exit` have no parser support today, so this file does NOT
# compile with build/ludicc — it is a design sketch of the intended syntax (see
# LANGUAGE.md §"Scenes & layers"). It is deliberately excluded from test.sh.
# Games that need scene-like states use a mode register + `machine` today, as
# examples/chronorift does.
game SceneDemo {
  const R_N: int = 0

  system Boot phase Start { setreg(R_N, 0)  print_int(1000) }

  scene Title start {
    on enter { print_int(1) }
    on exit  { print_int(2) }
    layer Main {
      system Tick phase Update {
        setreg(R_N, reg(R_N) + 1)
        print_int(100 + reg(R_N))
        if reg(R_N) >= 2 { enter Play }
      }
    }
  }

  scene Play {
    on enter { print_int(3)  setreg(R_N, 0) }
    on exit  { print_int(4) }
    layer World {
      system Step phase Update {
        setreg(R_N, reg(R_N) + 1)
        print_int(200 + reg(R_N))
        if reg(R_N) >= 2 { quit() }
      }
    }
    layer Hud {
      system Draw phase Render { print_int(900) }
    }
  }
}