From 713e3e0197cdf17e82783b12131519a89b389718 Mon Sep 17 00:00:00 2001
From: yuriha-chan <yuriha.tsuchiura@gmail.com>
Date: Thu, 15 Jun 2023 22:30:08 +0900
Subject: [PATCH 1/4] Suppress ReferenceError on some environments (i.e. older
 iOS)

---
 packages/frontend/src/workers/test-webgl2.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/frontend/src/workers/test-webgl2.ts b/packages/frontend/src/workers/test-webgl2.ts
index 4769524d9c..0c07094ab3 100644
--- a/packages/frontend/src/workers/test-webgl2.ts
+++ b/packages/frontend/src/workers/test-webgl2.ts
@@ -1,3 +1,7 @@
+if (!OffscreenCanvas) {
+    postMessage({ result: false });
+    return;
+}
 const canvas = new OffscreenCanvas(1, 1);
 const gl = canvas.getContext('webgl2');
 if (gl) {

From fc54e56ca70a2d7e9104aa1077a1979db98cd402 Mon Sep 17 00:00:00 2001
From: yuriha-chan <yuriha.tsuchiura@gmail.com>
Date: Thu, 15 Jun 2023 23:09:19 +0900
Subject: [PATCH 2/4] fix

---
 packages/frontend/src/workers/test-webgl2.ts | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/packages/frontend/src/workers/test-webgl2.ts b/packages/frontend/src/workers/test-webgl2.ts
index 0c07094ab3..2b489062cf 100644
--- a/packages/frontend/src/workers/test-webgl2.ts
+++ b/packages/frontend/src/workers/test-webgl2.ts
@@ -1,11 +1,11 @@
-if (!OffscreenCanvas) {
-    postMessage({ result: false });
-    return;
-}
-const canvas = new OffscreenCanvas(1, 1);
-const gl = canvas.getContext('webgl2');
-if (gl) {
-    postMessage({ result: true });
+if (window.OffscreenCanvas) {
+    const canvas = new OffscreenCanvas(1, 1);
+    const gl = canvas.getContext('webgl2');
+    if (gl) {
+        postMessage({ result: true });
+    } else {
+        postMessage({ result: false });
+    }
 } else {
     postMessage({ result: false });
 }

From 211833889883560642b87d1bb2185a9fc5be57ee Mon Sep 17 00:00:00 2001
From: yuriha-chan <yuriha.tsuchiura@gmail.com>
Date: Thu, 15 Jun 2023 23:20:27 +0900
Subject: [PATCH 3/4] fix

---
 packages/frontend/src/workers/test-webgl2.ts | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/packages/frontend/src/workers/test-webgl2.ts b/packages/frontend/src/workers/test-webgl2.ts
index 2b489062cf..bdd582788f 100644
--- a/packages/frontend/src/workers/test-webgl2.ts
+++ b/packages/frontend/src/workers/test-webgl2.ts
@@ -1,4 +1,5 @@
-if (window.OffscreenCanvas) {
+try {
+    // throw ReferenceError in Safari <= 16.3
     const canvas = new OffscreenCanvas(1, 1);
     const gl = canvas.getContext('webgl2');
     if (gl) {
@@ -6,6 +7,7 @@ if (window.OffscreenCanvas) {
     } else {
         postMessage({ result: false });
     }
-} else {
+} catch (e) {
+    // assert(e instanceof ReferenceError)
     postMessage({ result: false });
 }

From 68b3305a9f77d3322521c8c262e86f8ac1af4172 Mon Sep 17 00:00:00 2001
From: yuriha-chan <yuriha.tsuchiura@gmail.com>
Date: Thu, 15 Jun 2023 23:49:44 +0900
Subject: [PATCH 4/4] lint

---
 packages/frontend/src/workers/test-webgl2.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/frontend/src/workers/test-webgl2.ts b/packages/frontend/src/workers/test-webgl2.ts
index bdd582788f..5027fa0784 100644
--- a/packages/frontend/src/workers/test-webgl2.ts
+++ b/packages/frontend/src/workers/test-webgl2.ts
@@ -7,7 +7,7 @@ try {
     } else {
         postMessage({ result: false });
     }
-} catch (e) {
+} catch (err) {
     // assert(e instanceof ReferenceError)
     postMessage({ result: false });
 }