feat: actors stage 2

app/main.ts

@@ -1,7 +1,7 @@
 import { RenderConfig } from "../engine/render/RenderConfig"
 import { Camera } from "../engine/scene/Camera"
 import type { Mesh } from "../engine/scene/Mesh"
-import { Mob } from "../engine/scene/Mob"
+import { Mob, MOB_KINDS, type MobKind } from "../engine/scene/Mob"
 import type { Vec3 } from "../engine/math/Vec3"
 import { loadTextures } from "./assets"
 import { buildLevel, type Level } from "./level"
@@ -48,21 +48,22 @@ function benchStats(a: number[]): { median: number; p95: number; max: number; me
 async function main(): Promise<void> {
   const textures = await loadTextures()
   const level = buildLevel(textures)
-  // Two canonical mob meshes, built once and shared by every instance (the sim
-  // supplies each mob's per-frame transform).
-  const frogMesh: Mesh = { verts: [], indices: [] }
-  const beeMesh: Mesh = { verts: [], indices: [] }
-  const robinMesh: Mesh = { verts: [], indices: [] }
-  Mob.build("frog", frogMesh)
-  Mob.build("bee", beeMesh)
-  Mob.build("robin", robinMesh)
+  // Build each kind's canonical mesh once, shared by every instance (the sim
+  // supplies each mob's per-frame transform). Registry-driven -- a new kind needs
+  // no change here.
+  const mobMesh = {} as Record<MobKind, Mesh>
+  for (const kind of MOB_KINDS) {
+    const m: Mesh = { verts: [], indices: [] }
+    Mob.build(kind, m)
+    mobMesh[kind] = m
+  }
   const scene: Scene = {
     chunks: level.chunks,
     floor: level.floor,
     walls: level.walls,
     crate: level.crate,
     npc: { position: level.npcPosition, size: { x: 1.1, y: 1.5 } },
-    mobMesh: { frog: frogMesh, bee: beeMesh, robin: robinMesh },
+    mobMesh,
     mobCount: level.mobs.length,
     sky: level.sky,
     textures,