From d3eb3867bdfea6ebc71170f53b87deb1adcf8a7f Mon Sep 17 00:00:00 2001
From: syuilo <4439005+syuilo@users.noreply.github.com>
Date: Sat, 16 May 2026 10:49:25 +0900
Subject: [PATCH] handle lost event

---
 .../src/world/engineControllerBase.ts         | 30 ++++++++++++++-----
 .../src/world/room/previewEngineWorker.ts     |  3 ++
 packages/frontend/src/world/room/worker.ts    |  3 ++
 3 files changed, 29 insertions(+), 7 deletions(-)

diff --git a/packages/frontend/src/world/engineControllerBase.ts b/packages/frontend/src/world/engineControllerBase.ts
index e155467442..805b8aa20a 100644
--- a/packages/frontend/src/world/engineControllerBase.ts
+++ b/packages/frontend/src/world/engineControllerBase.ts
@@ -70,6 +70,10 @@ export abstract class EngineControllerBase<T extends RoomEngineBase> {
 						}
 						break;
 					}
+					case 'contextlost': {
+						this.onContextLost();
+						break;
+					}
 					default: {
 						console.warn('Unrecognized message from worker:', event.data?.type);
 					}
@@ -79,14 +83,18 @@ export abstract class EngineControllerBase<T extends RoomEngineBase> {
 			const babylonEngine = new BABYLON.WebGPUEngine(canvas, { doNotHandleContextLost: true, powerPreference: 'high-performance', antialias: this.options.antialias });
 			babylonEngine.compatibilityMode = false;
 			babylonEngine.enableOfflineSupport = false;
-			babylonEngine.onContextLostObservable.add(() => {
-				os.alert({
-					type: 'error',
-					title: i18n.ts.somethingHappened,
-					text: i18n.ts._miWorld.crushed_description,
-				});
-			});
 			await babylonEngine.initAsync();
+			// doNotHandleContextLostがtrueだとそもそも呼ばれない
+			//babylonEngine.onContextLostObservable.add(() => {
+			//	os.alert({
+			//		type: 'error',
+			//		title: i18n.ts.somethingHappened,
+			//		text: i18n.ts._miWorld.crushed_description,
+			//	});
+			//});
+			babylonEngine._device.lost.then(() => { // TODO: babylonEngineの内部プロパティに依存しない方法をforumで聞く
+				this.onContextLost();
+			});
 			if (this.options.resolution === 2) babylonEngine.setHardwareScalingLevel(0.5);
 			if (this.options.resolution === 0.5) babylonEngine.setHardwareScalingLevel(2);
 
@@ -270,6 +278,14 @@ export abstract class EngineControllerBase<T extends RoomEngineBase> {
 		this.initializeProgress.value = 0;
 	}
 
+	private onContextLost() {
+		os.alert({
+			type: 'error',
+			title: i18n.ts.somethingHappened,
+			text: i18n.ts._miWorld.crushed_description,
+		});
+	}
+
 	private callCounter = 0;
 
 	protected call<FN extends keyof T>(fn: FN, args: Parameters<T[FN]> = [] as any): void {
diff --git a/packages/frontend/src/world/room/previewEngineWorker.ts b/packages/frontend/src/world/room/previewEngineWorker.ts
index 644eb16ac0..5d0615e1c1 100644
--- a/packages/frontend/src/world/room/previewEngineWorker.ts
+++ b/packages/frontend/src/world/room/previewEngineWorker.ts
@@ -20,6 +20,9 @@ onmessage = async (event) => {
 			babylonEngine.compatibilityMode = false;
 			babylonEngine.enableOfflineSupport = false;
 			await babylonEngine.initAsync();
+			babylonEngine._device.lost.then(() => { // TODO: babylonEngineの内部プロパティに依存しない方法をforumで聞く
+				self.postMessage({ type: 'contextlost' });
+			});
 			if (event.data.options.resolution === 2) babylonEngine.setHardwareScalingLevel(0.5);
 			if (event.data.options.resolution === 0.5) babylonEngine.setHardwareScalingLevel(2);
 
diff --git a/packages/frontend/src/world/room/worker.ts b/packages/frontend/src/world/room/worker.ts
index 078c647033..63a914a9f5 100644
--- a/packages/frontend/src/world/room/worker.ts
+++ b/packages/frontend/src/world/room/worker.ts
@@ -24,6 +24,9 @@ onmessage = async (event) => {
 			babylonEngine.compatibilityMode = false;
 			babylonEngine.enableOfflineSupport = false;
 			await babylonEngine.initAsync();
+			babylonEngine._device.lost.then(() => { // TODO: babylonEngineの内部プロパティに依存しない方法をforumで聞く
+				self.postMessage({ type: 'contextlost' });
+			});
 			if (event.data.options.resolution === 2) babylonEngine.setHardwareScalingLevel(0.5);
 			if (event.data.options.resolution === 0.5) babylonEngine.setHardwareScalingLevel(2);