From f23d1e9c1603fbce9e43a9a8b7b28ee2e4f8cb03 Mon Sep 17 00:00:00 2001
From: Pavel Rojtberg <pavel.rojtberg@igd.fraunhofer.de>
Date: Wed, 13 Mar 2019 16:45:31 +0100
Subject: [PATCH] ovis: allow disabling VSYNC - useful in multiwindow scenarios

or with batch rendering
---
 modules/ovis/src/ovis.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/modules/ovis/src/ovis.cpp b/modules/ovis/src/ovis.cpp
index 95e68f3c7..0f6d5889f 100644
--- a/modules/ovis/src/ovis.cpp
+++ b/modules/ovis/src/ovis.cpp
@@ -227,7 +227,8 @@ struct Application : public OgreBites::ApplicationContext, public OgreBites::Inp
         if (flags & SCENE_AA)
             miscParams["FSAA"] = "4";
 
-        miscParams["vsync"] = "true";
+        miscParams["vsync"] = Ogre::StringConverter::toString(
+            !utils::getConfigurationParameterBool("OPENCV_OVIS_NOVSYNC", false));
 
         OgreBites::NativeWindowPair ret =
             OgreBites::ApplicationContext::createWindow(_name, _w, _h, miscParams);