From 65e62141a955420e10c22b14579c99aa07027e29 Mon Sep 17 00:00:00 2001
From: Alon Zakai <alonzakai@gmail.com>
Date: Mon, 16 Jun 2014 14:43:45 -0700
Subject: skip a frame if Module.preMainLoop returns false

---
 src/library_browser.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/library_browser.js b/src/library_browser.js
index 8e86371e..357bd96b 100644
--- a/src/library_browser.js
+++ b/src/library_browser.js
@@ -44,7 +44,12 @@ mergeInto(LibraryManager.library, {
       },
       runIter: function(func) {
         if (ABORT) return;
-        if (Module['preMainLoop']) Module['preMainLoop']();
+        if (Module['preMainLoop']) {
+          var preRet = Module['preMainLoop']();
+          if (preRet === false) {
+            return; // |return false| skips a frame
+          }
+        }
         try {
           func();
         } catch (e) {
-- 
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