From 096b56b5c5432d022e7e1a011609c727de12e591 Mon Sep 17 00:00:00 2001
From: Pierre Renaux <pierre@talansoft.com>
Date: Fri, 6 Apr 2012 12:45:09 +0800
Subject: [src/library_glut.js]: Call motion callbacks only if motion position
 changed ;

---
 src/library_glut.js | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'src/library_glut.js')

diff --git a/src/library_glut.js b/src/library_glut.js
index cdbb347b..f1a3f00e 100644
--- a/src/library_glut.js
+++ b/src/library_glut.js
@@ -36,6 +36,15 @@ var LibraryGLUT = {
     },
 
     onMousemove: function(event) {
+      /* Pierre: Send motion event only if the motion changed, prevents
+       * spamming our app with uncessary callback call. It does happen in
+       * Chrome on Windows.
+       */
+      var newX = event['clientX'] - Module['canvas'].offsetLeft;
+      var newY = event['clientY'] - Module['canvas'].offsetTop;
+      if (newX == GLUT['lastX'] && newY == GLUT['lastY'])
+        return;
+
       GLUT.savePosition(event);
       if (GLUT.buttons == 0 && event.target == Module["canvas"] && GLUT.passiveMotionFunc) {
         event.preventDefault();
-- 
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