disable blending in second color attachment on water node

apps/openmw/mwrender/water.cpp

@@ -565,6 +565,8 @@ namespace MWRender
         else
             createSimpleWaterStateSet(mWaterGeom, Fallback::Map::getFloat("Water_World_Alpha"));
 
+        mResourceSystem->getSceneManager()->setUpNormalsRTForStateSet(mWaterGeom->getOrCreateStateSet(), true);
+
         updateVisible();
     }
 

components/resource/scenemanager.cpp

@@ -4,6 +4,7 @@
 #include <filesystem>
 
 #include <osg/AlphaFunc>
+#include <osg/Capability>
 #include <osg/ColorMaski>
 #include <osg/Group>
 #include <osg/Node>
@@ -607,6 +608,9 @@ namespace Resource
         if (!getSupportsNormalsRT())
             return;
         stateset->setAttributeAndModes(new osg::ColorMaski(1, enabled, enabled, enabled, enabled));
+
+        if (enabled)
+            stateset->setAttributeAndModes(new osg::Disablei(GL_BLEND, 1));
     }
 
     /// @brief Callback to read image files from the VFS.