Fix fog on water

apps/openmw/mwrender/water.cpp

@@ -306,7 +306,12 @@ public:
         setUpdateCallback(new NoTraverseCallback);
 
         // No need for fog here, we are already applying fog on the water surface itself as well as underwater fog
-        getOrCreateStateSet()->setMode(GL_FOG, osg::StateAttribute::OFF|osg::StateAttribute::OVERRIDE);
+        // assign large value to effectively turn off fog
+        // shaders don't respect glDisable(GL_FOG)
+        osg::ref_ptr<osg::Fog> fog (new osg::Fog);
+        fog->setStart(10000000);
+        fog->setEnd(10000000);
+        getOrCreateStateSet()->setAttributeAndModes(fog, osg::StateAttribute::OFF|osg::StateAttribute::OVERRIDE);
 
         mClipCullNode = new ClipCullNode;
         addChild(mClipCullNode);