Water: fix world UV coords

apps/openmw/mwrender/water.cpp

@@ -458,6 +458,11 @@ void Water::changeCell(const MWWorld::CellStore* store)
         mWaterNode->setPosition(getSceneNodeCoordinates(store->getCell()->mData.mX, store->getCell()->mData.mY));
     else
         mWaterNode->setPosition(osg::Vec3f(0,0,mTop));
+
+    // create a new StateSet to prevent threading issues
+    osg::ref_ptr<osg::StateSet> nodeStateSet (new osg::StateSet);
+    nodeStateSet->addUniform(new osg::Uniform("nodePosition", osg::Vec3f(mWaterNode->getPosition())));
+    mWaterNode->setStateSet(nodeStateSet);
 }
 
 void Water::setHeight(const float height)

files/shaders/water_fragment.glsl

@@ -70,11 +70,11 @@ uniform float osg_SimulationTime;
 
 uniform float near;
 uniform float far;
+uniform vec3 nodePosition;
 
 void main(void)
 {
-    // FIXME
-    vec3 worldPos = position.xyz; // ((wMat) * ( position)).xyz;
+    vec3 worldPos = position.xyz + nodePosition.xyz;
     vec2 UV = worldPos.xy / (8192.0*5.0) * 3.0;
     UV.y *= -1.0;