Architecture

Hodos is an open world ABI and specification, not a single game engine implementation.

Worlds · games · simulations · social spaces
Editors · launchers · collaboration · publication
Renderers · physics · media · XR · wallet adapters
──────────────── HODOS PROFILES ────────────────
───────────────── HODOS CORE ──────────────────
World format · Browser↔Hara ABI · capabilities
Lifecycle · engagement · conformance
────────────────────────────────────────────────
Hara kernel             Standards-based web host
WebAssembly             Browser APIs
Operating system · devices · networks

Above Hodos

Systems above Hodos interpret or extend the portable world contract:

• world applications and games;
• viewers, editors, launchers, studios, and marketplaces;
• 2D, 3D, splat, WebGPU, and XR renderers;
• physics, animation, avatar, AI, and simulation systems;
• multiplayer, collaboration, publication, and discovery;
• chain, account, wallet, and asset adapters.

A conforming world should remain meaningful when one implementation is replaced by another implementation that supports the same profiles.

Hodos itself

The normative centre contains six concerns:

1. common identifiers, values, envelopes, errors, and lifecycle;
2. a source-neutral world definition;
3. the serializable Browser–Hara Host ABI;
4. capability and permission negotiation;
5. semantic engagement;
6. profiles and conformance.

The specification index links the current drafts.

Below Hodos

Hodos relies on lower layers but does not redefine them:

• Hara compilation, packaging, scheduling, and execution;
• WebAssembly;
• browser event loops and permission UX;
• browser graphics, input, media, storage, network, crypto, identity, and device APIs;
• operating systems, hardware, networks, chains, and custody systems.

Reference implementation

The existing packages remain a useful implementation laboratory. PlayCanvas, GitHub, OPFS, Web Audio, Web Crypto, Hestia contribution flows, and the browser-native editor prove the boundary, but they do not become required parts of Hodos merely because the first-party demo uses them.