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docs(roadmap): mark Phase A.3 (background net receive thread) as shipped

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All Foundation sub-pieces now shipped:
  A.1 ✓ Streaming landblock loader
  A.2 ✓ Frustum culling (~160fps)
  A.3 ✓ Background net receive thread
  A.4   Folded into A.1 (deferred — DatCollection not thread-safe)

Phase A (Foundation) is complete. Next: Phase B (Gameplay).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Erik 2026-04-12 09:24:59 +02:00
parent 5e96521f92
commit 0a20090eba
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docs/plans/2026-04-11-roadmap.md
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@ -30,6 +30,7 @@
| 9.2 | Back-face culling in translucent pass (fixes lifestone crystal) | Visual ✓ | | 9.2 | Back-face culling in translucent pass (fixes lifestone crystal) | Visual ✓ |
| A.1 | Streaming landblock loader — runtime-configurable visible window (default 5×5, `ACDREAM_STREAM_RADIUS`), camera-centered offline / player-centered live, hysteresis-based unloads, pending-spawn list for late CreateObject events | Live ✓ | | A.1 | Streaming landblock loader — runtime-configurable visible window (default 5×5, `ACDREAM_STREAM_RADIUS`), camera-centered offline / player-centered live, hysteresis-based unloads, pending-spawn list for late CreateObject events | Live ✓ |
| A.2 | Frustum culling — per-landblock AABB test (Gribb-Hartmann), terrain + static-mesh renderers skip culled landblocks, perf overlay in window title | Visual ✓ | | A.2 | Frustum culling — per-landblock AABB test (Gribb-Hartmann), terrain + static-mesh renderers skip culled landblocks, perf overlay in window title | Visual ✓ |
| A.3 | Background net receive thread — dedicated daemon thread buffers UDP into Channel, render thread drains | Visual ✓ |
Plus polish that doesn't get its own phase number: Plus polish that doesn't get its own phase number:
- FlyCamera default speed lowered + Shift-to-boost - FlyCamera default speed lowered + Shift-to-boost
@ -48,7 +49,7 @@ Plus polish that doesn't get its own phase number:
**Sub-pieces:** **Sub-pieces:**
- **✓ SHIPPED — A.1 — Streaming landblock loader.** Runtime-configurable visible window (default 5×5, `ACDREAM_STREAM_RADIUS` env var override). Center follows the fly camera offline and the server-sent player position in live mode. Currently runs **synchronously** on the render thread — the original async-worker design hit DatCollection's lack of thread safety and was reverted for correctness. The Channel-based outbox API is preserved so async loading can return cleanly when `Phase A.3` introduces a thread-safe dat wrapper. Pending-spawn list in `GpuWorldState` parks live `CreateObject` events whose target landblock hasn't been streamed in yet and back-fills them when it arrives, so spawn-vs-streaming races are no longer racy at all. `MaxCompletionsPerFrame=4` spreads the 5×5 first-frame load over ~7 frames (~116ms) to avoid GPU OOM. - **✓ SHIPPED — A.1 — Streaming landblock loader.** Runtime-configurable visible window (default 5×5, `ACDREAM_STREAM_RADIUS` env var override). Center follows the fly camera offline and the server-sent player position in live mode. Currently runs **synchronously** on the render thread — the original async-worker design hit DatCollection's lack of thread safety and was reverted for correctness. The Channel-based outbox API is preserved so async loading can return cleanly when `Phase A.3` introduces a thread-safe dat wrapper. Pending-spawn list in `GpuWorldState` parks live `CreateObject` events whose target landblock hasn't been streamed in yet and back-fills them when it arrives, so spawn-vs-streaming races are no longer racy at all. `MaxCompletionsPerFrame=4` spreads the 5×5 first-frame load over ~7 frames (~116ms) to avoid GPU OOM.
- **✓ SHIPPED — A.2 — Frustum culling.** Per-landblock AABB test (Gribb-Hartmann plane extraction + positive-vertex AABB test) in both `TerrainRenderer.Draw` and `StaticMeshRenderer.Draw`. Per-entity culling deferred. LOD deferred to Phase C. Performance overlay in window title shows FPS, frame time, visible/total landblock ratio, entity count, animated count. ~160fps uncapped at 5×5 radius. - **✓ SHIPPED — A.2 — Frustum culling.** Per-landblock AABB test (Gribb-Hartmann plane extraction + positive-vertex AABB test) in both `TerrainRenderer.Draw` and `StaticMeshRenderer.Draw`. Per-entity culling deferred. LOD deferred to Phase C. Performance overlay in window title shows FPS, frame time, visible/total landblock ratio, entity count, animated count. ~160fps uncapped at 5×5 radius.
- **A.3 — Background net I/O thread.** `WorldSession` runs its receive loop on a dedicated thread; parsed game messages are posted to a concurrent queue the render thread drains from `OnUpdate`. Event invocations still happen on the render thread (preserves existing handler assumptions). Removes packet drops under frame stalls. - **✓ SHIPPED — A.3 — Background net receive thread.** Dedicated daemon thread continuously pulls raw UDP datagrams from the kernel buffer into a `Channel<byte[]>`. Render thread's `Tick()` drains the channel. All decode, fragment assembly, ISAAC crypto, event dispatch, and ack-sending remain on the render thread — minimal change that prevents packet drops during frame stalls. Thread starts after `EnterWorld()` completes; `PumpOnce()` during handshake still reads the socket directly.
- **A.4 — Async dat decoding.** Folded into the streaming worker — it's the worker's read path, not a separate subsystem. Called out here because regressions in dat caching could land on this surface. - **A.4 — Async dat decoding.** Folded into the streaming worker — it's the worker's read path, not a separate subsystem. Called out here because regressions in dat caching could land on this surface.
**Acceptance:** **Acceptance:**