From 913bbe347b0b0704800d61b3470d11fc69e36ab7 Mon Sep 17 00:00:00 2001
From: scrawl <scrawl@baseoftrash.de>
Date: Mon, 2 Nov 2015 00:52:20 +0100
Subject: [PATCH] Don't check the extension string every frame

---
 apps/openmw/mwrender/water.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/apps/openmw/mwrender/water.cpp b/apps/openmw/mwrender/water.cpp
index c44f480f8..c6061b40a 100644
--- a/apps/openmw/mwrender/water.cpp
+++ b/apps/openmw/mwrender/water.cpp
@@ -426,8 +426,12 @@ class DepthClampCallback : public osg::Drawable::DrawCallback
 public:
     virtual void drawImplementation(osg::RenderInfo& renderInfo,const osg::Drawable* drawable) const
     {
-        if (!osg::isGLExtensionOrVersionSupported(renderInfo.getState()->getContextID(), "GL_ARB_depth_clamp", 3.3))
+        static bool supported = osg::isGLExtensionOrVersionSupported(renderInfo.getState()->getContextID(), "GL_ARB_depth_clamp", 3.3);
+        if (!supported)
+        {
             drawable->drawImplementation(renderInfo);
+            return;
+        }
 
         glEnable(GL_DEPTH_CLAMP);