1 files changed, 8 insertions, 2 deletions
diff --git a/src/webGLClient.js b/src/webGLClient.js
index 193d5dfa..81310814 100644
--- a/src/webGLClient.js
+++ b/src/webGLClient.js
@@ -1,10 +1,16 @@
 // WebGLWorker client code
 
 function WebGLClient() {
+}
+
+WebGLClient.prefetch = function() {
+  var canvas = document.createElement('canvas');
+  var ctx = canvas.getContext('webgl-experimental') || canvas.getContext('webgl');
+  if (!ctx) return;
   var data = {};
   ['MAX_VERTEX_ATTRIBS'].forEach(function(name) {
-    data[name] = Module.ctx.getParameter(Module.ctx[name]);
+    data[ctx[name]] = ctx.getParameter(ctx[name]);
   });
   worker.postMessage({ target: 'gl', op: 'setPrefetchedParameters', data: data });
-}
+};