diff --git a/js/config.js b/js/config.js
index ffbab60..dd2b086 100644
--- a/js/config.js
+++ b/js/config.js
@@ -186,18 +186,18 @@ paramMapping.dropLength = paramMapping.raindropLength;
 paramMapping.angle = paramMapping.slant;
 paramMapping.colors = paramMapping.stripeColors;
 
-export default (searchString) => {
-	const urlParams = Object.fromEntries(
-		Array.from(new URLSearchParams(searchString).entries())
+export default (urlParams) => {
+	const validParams = Object.fromEntries(
+		Array.from(Object.entries(urlParams))
 			.filter(([key]) => key in paramMapping)
 			.map(([key, value]) => [paramMapping[key].key, paramMapping[key].parser(value)])
 			.filter(([_, value]) => value != null)
 	);
 
-	const version = urlParams.version in versions ? versions[urlParams.version] : versions.classic;
+	const version = validParams.version in versions ? versions[validParams.version] : versions.classic;
 
 	return {
 		...version,
-		...urlParams,
+		...validParams,
 	};
 };
diff --git a/js/main.js b/js/main.js
index dde8c45..35c86be 100644
--- a/js/main.js
+++ b/js/main.js
@@ -9,10 +9,11 @@ document.addEventListener("touchmove", (e) => e.preventDefault(), {
 });
 
 document.body.onload = () => {
-	const config = makeConfig(window.location.search);
-	if (navigator.gpu != null) {
-		initWebGPU(canvas, config);
-	} else {
+	const urlParams = Object.fromEntries(new URLSearchParams(window.location.search).entries());
+	const config = makeConfig(urlParams);
+	if (navigator.gpu == null || ["webgl", "regl"].includes(urlParams.renderer?.toLowerCase())) {
 		initREGL(canvas, config);
+	} else {
+		initWebGPU(canvas, config);
 	}
 };