From 0f7678fc5b897f1c69631108a394e448b727db95 Mon Sep 17 00:00:00 2001
From: Codezigineer <53050996+Codezigineer@users.noreply.github.com>
Date: Mon, 21 Nov 2022 09:52:00 -0800
Subject: [PATCH] Add OffscreenCanvas

---
 js/tinygl.js | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/js/tinygl.js b/js/tinygl.js
index c4aab50..8e118da 100644
--- a/js/tinygl.js
+++ b/js/tinygl.js
@@ -2513,3 +2513,24 @@ if ((typeof HTMLCanvasElement) != 'undefined') {
 	} catch (e) {
 	}
 }
+
+/* Also add for offscreenCanvas */
+if ((typeof OffscreenCanvas) != 'undefined') {
+	try {
+		var default_get_context_func = OffscreenCanvas.prototype.getContext;
+		OffscreenCanvas.prototype.getContext = function() {
+			if (arguments[0] == 'experimental-tinygl') {
+				try {
+					// initialize TinyGL runtime if not yet
+					if (!TinyGLRenderingContext)
+						initializeTinyGLRuntime(arguments[1]);
+					return new TinyGLRenderingContext(this, arguments[1]);
+				} catch (e) {
+					return null;
+				}
+			}
+			return default_get_context_func.apply(this, arguments);
+		};
+	} catch (e) {
+	}
+};