Add adaptive progression and item expansion

js/state.js

@@ -0,0 +1,61 @@
+// ---- global game state ----
+const W = 960, H = 640, TILE = 64, WALL = 48, DOOR_HALF = 44;
+
+const G = {
+  mode: 'menu',        // menu | play | levelup | pause | gameover
+  time: 0,
+  floor: 1,
+  score: 0,
+  kills: 0,
+  player: null,
+  rooms: {},           // "x,y" -> room
+  cur: null,           // current room
+  enemies: [],
+  bullets: [],         // player projectiles
+  ebullets: [],        // enemy projectiles
+  pickups: [],
+  parts: [],           // particles
+  corpses: [],         // short-lived frame-animated deaths
+  hazards: [],         // acid/fire pools, traps (hurt enemies)
+  telegraphs: [],      // boss telegraphs -> effects (hurt player)
+  toasts: [],
+  shake: 0,
+  flash: 0,            // red screen flash when hurt
+  boss: null,          // live boss ref
+  pendingLevelups: 0,
+  perkChoices: null,
+  autoPerk: false,
+  pressure: 1,
+  streak: 0,
+  roomDamaged: false,
+  roomEnterT: 0,
+  recentHits: [],
+  transition: 0,       // room transition fade
+  muted: false,
+  sfxVol: 0.45,
+  musicVol: 0.55,
+  imagesLoaded: false,
+  roomLayer: null,
+  roomLayerKey: '',
+  atmosphereLayer: null,
+};
+
+const PERK_POWER_WEIGHT = 0.5;
+const PRESSURE_MIN = 0.75, PRESSURE_MAX = 1.60, PRESSURE_GAIN = 0.01;
+
+// total player power: perks drafted (level - 1) + item tiers owned.
+// monsters scale against this so difficulty tracks the build.
+function powerScore() {
+  const p = G.player;
+  if (!p) return 0;
+  let n = (p.level - 1) * PERK_POWER_WEIGHT;
+  for (const iid in p.items) n += p.items[iid];
+  return Math.max(0, n);
+}
+
+function addShake(n) { G.shake = Math.min(G.shake + n, 18); }
+function addToast(text, sub) {
+  G.toasts.push({ text, sub: sub || '', t: 0 });
+  if (G.toasts.length > 3) G.toasts.shift();
+}
+function addScore(n) { G.score += n; }