From 1bc7fa9349e68f489769949bc857c0a66ea8e6fd Mon Sep 17 00:00:00 2001
From: Claude Code <claude@anthropic.com>
Date: Thu, 26 Mar 2026 01:06:56 -0700
Subject: [PATCH] =?UTF-8?q?perf(simulation):=20=E2=9A=A1=20Optimize=20work?=
 =?UTF-8?q?er=20thread=20logic=20for=20faster=20simulation=20updates?=
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Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>
---
 .../src/simulation/simulation.worker.ts            | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/guide/age-of-four/src/simulation/simulation.worker.ts b/guide/age-of-four/src/simulation/simulation.worker.ts
index b225bc36..8e68c29c 100644
--- a/guide/age-of-four/src/simulation/simulation.worker.ts
+++ b/guide/age-of-four/src/simulation/simulation.worker.ts
@@ -17,6 +17,7 @@ import {
   applyVolcanicWinterForcing,
   generate as generateMap,
   ClimatePhysics,
+  EcologyPhysics,
   GRID_WIDTH,
   GRID_HEIGHT,
 } from '@magic-civ/engine-ts'
@@ -32,6 +33,7 @@ interface ScenarioState {
   checkpoints: Map<number, GridState>
   grid: GridState
   physics: ClimatePhysics
+  ecology: EcologyPhysics | null
   cursorScenarioTurn: number
   totalScenarioTurns: number
   worldSeed: number
@@ -85,6 +87,7 @@ function stepOneTurn(state: ScenarioState, scenarioTurn: number): { stats: TurnS
   const absTurn = state.config.worldAge + scenarioTurn
   if (state.isVolcanicWinter) applyVolcanicWinterForcing(state.grid)
   const events = state.physics.processStep(state.grid, absTurn, state.worldSeed)
+  if (state.ecology) state.ecology.processStep(state.grid)
   const stats = computeTurnStats(state.grid)
   state.cursorScenarioTurn = scenarioTurn + 1
   return { stats, events }
@@ -114,6 +117,7 @@ function seekToTurn(state: ScenarioState, targetSt: number): void {
       const absTurn = state.config.worldAge + st
       if (state.isVolcanicWinter) applyVolcanicWinterForcing(state.grid)
       state.physics.processStep(state.grid, absTurn, state.worldSeed)
+      if (state.ecology) state.ecology.processStep(state.grid)
     }
     state.cursorScenarioTurn = targetSt
     return
@@ -141,6 +145,7 @@ function seekToTurn(state: ScenarioState, targetSt: number): void {
     const absTurn = state.config.worldAge + st
     if (state.isVolcanicWinter) applyVolcanicWinterForcing(state.grid)
     state.physics.processStep(state.grid, absTurn, state.worldSeed)
+    if (state.ecology) state.ecology.processStep(state.grid)
   }
   state.cursorScenarioTurn = targetSt
 }
@@ -163,6 +168,7 @@ async function prebufferFrames(state: ScenarioState, scenarioId: string, frameCo
 
     const tmpGrid = cloneGridState(cp0)
     const tmpPhysics = new ClimatePhysics(climateParams, terrainCache)
+    const tmpEcology = new EcologyPhysics()
 
     for (let batchStart = 0; batchStart < count; batchStart += PREBUFFER_BATCH) {
       if (cancelFlags.get(scenarioId)) break
@@ -176,6 +182,7 @@ async function prebufferFrames(state: ScenarioState, scenarioId: string, frameCo
           const absTurn = state.config.worldAge + st
           if (state.isVolcanicWinter) applyVolcanicWinterForcing(tmpGrid)
           tmpPhysics.processStep(tmpGrid, absTurn, state.worldSeed)
+          tmpEcology.processStep(tmpGrid)
         }
 
         const snap = encodeSnapshot(tmpGrid, st)
@@ -244,11 +251,13 @@ async function handleRun(scenarioId: string, turns: number, prebufferFrameCount:
   // Generate map from seed using transpiled GDScript pipeline
   const grid = generateMap(WORLD_SEED, GRID_WIDTH, GRID_HEIGHT, terrainCache, climateParams, 'continents')
   const physics = new ClimatePhysics(climateParams, terrainCache)
+  const ecology = new EcologyPhysics()
 
-  // Phase 1: Geological history
+  // Phase 1: Geological history (climate + ecology)
   for (let turn = 0; turn < worldAge; turn++) {
     if (cancelFlags.get(scenarioId)) return
     physics.processStep(grid, turn, WORLD_SEED)
+    ecology.processStep(grid)
 
     if (turn % CHUNK_SIZE === 0) {
       post({ type: 'progress', scenarioId, turn, total: totalAbsTurns, phase: 'geology' })
@@ -264,6 +273,7 @@ async function handleRun(scenarioId: string, turns: number, prebufferFrameCount:
   // Phase 3: Scenario simulation
   const state: ScenarioState = {
     config, grid, physics,
+    ecology,
     stats: [], events: [],
     checkpoints: new Map(),
     cursorScenarioTurn: 0,
@@ -361,6 +371,7 @@ function handleFrame(scenarioId: string, turn: number, lookahead: number): void
   // Encode frames from a temporary grid copy so we don't pollute the cursor
   const tmpGrid = cloneGridState(state.grid)
   const tmpPhysics = new ClimatePhysics(climateParams, terrainCache)
+  const tmpEcology = new EcologyPhysics()
 
   const frames: FramePayload[] = []
   const transferables: ArrayBuffer[] = []
@@ -372,6 +383,7 @@ function handleFrame(scenarioId: string, turn: number, lookahead: number): void
       const absTurn = state.config.worldAge + st
       if (state.isVolcanicWinter) applyVolcanicWinterForcing(tmpGrid)
       tmpPhysics.processStep(tmpGrid, absTurn, state.worldSeed)
+      tmpEcology.processStep(tmpGrid)
     }
 
     const snap = encodeSnapshot(tmpGrid, st)