feat(controllers): #59 RPG systems — ludic.rpg 7-module suite (base + extensible)
Seven independently-usable modules on the six-lever contract with name-keyed data registries (zero-code content): movement (grid/free/tween, 4/8-axis, veto + interact), inventory + equipment (stat bonuses via the gameplay modifier stack), crafting, event-driven quests + flags, an Ink/Yarn dialog graph, Sokoban pushables + a switch/plate/gate signal graph, and over-time status effects through the Combat pipeline. Reuses ludic.gameplay Stats/Combat. Deterministic. 21-check example, in the suite (103 passed, 0 failed). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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examples/games/rpg_demo.ludic
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examples/games/rpg_demo.ludic
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# rpg_demo.ludic — the ludic.rpg suite (#59), all seven modules exercised headlessly
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# and deterministically: grid movement (+ wall block, MoveRequested veto, interact),
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# inventory + equipment stat bonus, crafting, event-driven quests, a dialog graph,
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# Sokoban pushables + a pressure-plate/gate signal graph, and a poison status effect.
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#
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# A full run prints: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 (21 checks)
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#
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# Build (from the repo root):
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# LUDIC_MODULES=packages ludicc --headless examples/games/rpg_demo.ludic
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program RpgDemo {
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import "ludic.rpg/mover.ludic"
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import "ludic.rpg/inventory.ludic"
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import "ludic.rpg/crafting.ludic"
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import "ludic.rpg/quests.ludic"
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import "ludic.rpg/dialog.ludic"
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import "ludic.rpg/puzzles.ludic"
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import "ludic.rpg/status.ludic"
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property Position { x: int = 0, y: int = 0 }
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property Body {
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vx: fixed = 0.0, vy: fixed = 0.0, gravity: fixed = 0.0, max_fall: fixed = 0.0,
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rx: fixed = 0.0, ry: fixed = 0.0, policy: int = 1,
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on_ground: int = 0, hit_wall: int = 0, hit_ceiling: int = 0
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}
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property Solids { tile: int = 0, wall: int = 0, oneway: int = 0 }
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model Hero { Position, Body, Mover, Inventory, Equipment, Stats, Dialog }
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model Npc { Position }
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model Block { Position, Pushable }
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model Plate { Position, Pressure }
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model Door { Position, Gate }
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model Cfg { Solids }
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@OnSpawn(Hero) handler HI { }
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@OnSpawn(Npc) handler NI { }
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@OnSpawn(Block) handler BI { }
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@OnSpawn(Plate) handler PLI { }
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@OnSpawn(Door) handler DOI { }
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@OnSpawn(Cfg) handler CI { }
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# a locked-door rule: veto a rightward grid step while `locked` is set (lever 4).
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var locked: int = 0
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@On(MoveRequested) handler LockDoor { if (locked == 1) and (dx == 1) { cancel } }
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var entered: int = 0
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@On(TileEntered) handler CountEnter { entered = entered + 1 }
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var talked: int = 0
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@On(Interacted) handler OnTalk { if target >= 0 { talked = talked + 1 } }
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var quest_done: int = 0
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@On(QuestCompleted) handler OnQuestDone { quest_done = quest_done + 1 }
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function tick_n(n: int) -> void { var i = 0; while i < n { tick_fixed(); i = i + 1 } }
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function bi(b: bool) -> int { if b { return 1 }; return 0 }
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function px(e: int) -> int { let P = World.prop_id("Position"); return World.get(e, P, World.field_id(P, "x")) }
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function py(e: int) -> int { let P = World.prop_id("Position"); return World.get(e, P, World.field_id(P, "y")) }
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function hp(e: int) -> int { let P = World.prop_id("Stats"); return World.get(e, P, World.field_id(P, "hp")) }
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entry {
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let PM = World.prop_id("Mover")
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# a 6x3 tile world; a wall glyph at cell (3,1)
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Map.size(6, 3)
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Map.row(0, "......")
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Map.row(1, "...#..")
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Map.row(2, "......")
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spawn Cfg { Solids { tile: 16, wall: '#', oneway: 0 } }
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spawn Hero { Position { x: 16, y: 16 }, Mover { mode: 0, step: 16, move_cd: 0, axes: 4 },
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Stats { hp: 20, max_hp: 20, atk: 5, def: 0 } }
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let h = World.query_next(PM, 0)
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# ================= Module A: grid movement =================
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# move down into the open cell (16,32)
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Mover.move(h, 0, 1); tick_n(1); Mover.move(h, 0, 0); tick_n(1)
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print(bi((px(h) == 16) and (py(h) == 32))) # 1 — stepped one cell down
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print(bi(entered >= 1)) # 1 — TileEntered fired
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# try to walk into the wall at cell (3,1)=(48,16): from (32,16) moving right blocked
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World.set(h, World.prop_id("Position"), World.field_id(World.prop_id("Position"), "x"), 32)
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World.set(h, World.prop_id("Position"), World.field_id(World.prop_id("Position"), "y"), 16)
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Mover.move(h, 1, 0); tick_n(1); Mover.move(h, 0, 0)
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print(bi(px(h) == 32)) # 1 — wall blocked the step
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# MoveRequested veto: a locked door forbids the rightward step (open cell now)
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World.set(h, World.prop_id("Position"), World.field_id(World.prop_id("Position"), "y"), 32) # row 2 open
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locked = 1
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Mover.move(h, 1, 0); tick_n(1); Mover.move(h, 0, 0)
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print(bi(px(h) == 32)) # 1 — vetoed, no move
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locked = 0
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Mover.move(h, 1, 0); tick_n(1); Mover.move(h, 0, 0)
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print(bi(px(h) == 48)) # 1 — now allowed
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# interact: an NPC one cell ahead (facing right after the last move)
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spawn Npc { Position { x: 64, y: 32 } }
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print(bi(Mover.interact(h) >= 0)) # 1 — found the NPC ahead
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print(bi(talked == 1)) # 1 — Interacted fired
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# ================= Module B: inventory + equipment =================
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Item.def("herb", 99, 1, 2)
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Item.def("sword", 1, 10, 50)
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Inventory.add(h, "herb", 5)
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print(bi(Inventory.count(h, "herb") == 5)) # 1
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print(bi(Inventory.use(h, "herb") == 1)) # 1 — consumed one (now 4)
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let atk0 = Stats.total(h, 1) # base atk 5
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Inventory.equip(h, 0, 1, 0, 10) # weapon: +10 flat atk
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print(bi(Stats.total(h, 1) == atk0 + 10)) # 1 — equipment bonus applies
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Inventory.unequip(h, 0)
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print(bi(Stats.total(h, 1) == atk0)) # 1 — removed on unequip
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# ================= Module C: crafting =================
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Craft.recipe("potion", "herb", 1) # 2 herb -> 1 (better) herb, toy recipe
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Craft.ingredient("potion", "herb", 2)
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Inventory.add(h, "herb", 2) # ensure >= 2
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let before = Inventory.count(h, "herb")
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print(bi(Craft.can(h, "potion") == 1)) # 1
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print(bi(Craft.make(h, "potion") == 1)) # 1 — consumed 2, produced 1
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print(bi(Inventory.count(h, "herb") == before - 1)) # 1 — net -2 + 1
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# ================= Module D: quests =================
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Quest.define("hunt")
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Quest.objective("hunt", 0, 0, 3) # kill any x3
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Quest.start("hunt")
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Quest.notify(0, 0, 1); Quest.notify(0, 0, 1); Quest.notify(0, 0, 1)
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print(bi(Quest.state_of("hunt") == 3)) # 1 — auto-completed
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print(bi(quest_done == 1)) # 1 — QuestCompleted fired
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# ================= Module E: dialog =================
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let dn0 = Dialog.node("elder", "hello")
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let dn1 = Dialog.node("elder", "farewell")
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Dialog.choice(dn0, "greet", dn1)
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Dialog.choice(dn1, "leave", 0 - 1)
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Dialog.start(h, "elder")
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print(bi(Dialog.line(h) == "hello")) # 1 — entry node text
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Dialog.choose(h, 0)
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print(bi(Dialog.line(h) == "farewell")) # 1 — advanced
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# ================= Module F: puzzles =================
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spawn Block { Position { x: 16, y: 0 }, Pushable { } } # cell (1,0), push to (2,0) — both open
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let blk = World.query_next(World.prop_id("Pushable"), 0)
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print(bi(Puzzle.push(16, 0, 1, 0, 16) == 1)) # 1 — pushed the block right
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spawn Plate { Position { x: 200, y: 200 }, Pressure { step: 16 } }
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let plate = World.query_next(World.prop_id("Pressure"), 0)
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spawn Door { Position { x: 300, y: 300 }, Gate { } }
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let door = World.query_next(World.prop_id("Gate"), 0)
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Puzzle.link(door, plate)
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tick_n(2)
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let closed = Puzzle.is_open(door) # 0 — nothing on the plate
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spawn Block { Position { x: 200, y: 200 }, Pushable { } } # weight on the plate
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tick_n(2)
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print(bi((closed == 0) and (Puzzle.is_open(door) == 1))) # 1 — plate -> gate opened
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# ================= Module G: status =================
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let hp0 = hp(h)
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Status.apply(h, 0, 3, 2, 8) # poison: 3 dmg every 2 frames for 8 frames
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tick_n(8)
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print(bi(hp(h) < hp0)) # 1 — poison ticked damage
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quit()
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}
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}
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