@downdraft/engine

Downdraft engine — a native-runtime game engine (winit + wgpu, no Electron, no browser shell). The JS host is interchangeable: Bun, Node, and Deno all run the same engine through a shared FFI/device layer.

Everything the engine ships is exposed as subpath exports of this one package:

• @downdraft/engine — core index (ECS, render loop, HostAPI types)
• @downdraft/engine/app/main — startGame() / bootstrapGame() game bootstrap
• @downdraft/engine/libraries/<name> — engine building blocks (physics, audio, models, water, weather, navmesh, gpu-kernels, …)
• @downdraft/engine/modules/<name> — opt-in feature modules with lifecycle + typed DI (movement-2d/3d, terrain, sailing, camera-controls, devtools, …)
• @downdraft/engine/platform/… — runtime adapters (native surface, FFI, SAB channels)

Install

bun add @downdraft/engine @downdraft/platform-native @downdraft/cli

@downdraft/platform-native supplies the native window/GPU device layer (prebuilt binaries per OS/arch arrive via optional dependencies).

Quick start

import { startGame } from "@downdraft/engine/app/main";

startGame({
  renderer: (canvas) => new WebGPURenderer(canvas),
  sim: (seed) => new SimWebWorker(seed?.libraryBuffers),
  simConfig: { seed: 12345 },
});

See the Downdraft engine repository for architecture docs and examples.