Sharing shadow maps across eyes.

Does not yet expand frustum.

apps/openmw/CMakeLists.txt

@@ -173,6 +173,8 @@ if(BUILD_VR_OPENXR)
         mwvr/vrsession.cpp
         mwvr/vrframebuffer.hpp
         mwvr/vrframebuffer.cpp
+        mwvr/vrshadow.hpp
+        mwvr/vrshadow.cpp 
         mwvr/vrtypes.hpp
         mwvr/vrtypes.cpp 
         mwvr/vrview.hpp

apps/openmw/mwvr/openxrmanagerimpl.hpp

@@ -100,7 +100,7 @@ namespace MWVR
         bool mSessionRunning = false;
         std::mutex mFrameStateMutex{};
         std::mutex mEventMutex{};
-        std::set<const char*> mEnabledExtensions;
+        std::set<std::string> mEnabledExtensions;
 
         std::array<XrCompositionLayerDepthInfoKHR, 2> mLayerDepth;
     };

apps/openmw/mwvr/vrsession.cpp

@@ -71,27 +71,9 @@ namespace MWVR
         return fov.perspectiveMatrix(near_, far_);
     }
 
-    osg::Matrix VRSession::viewMatrix(FramePhase phase, Side side)
+    osg::Matrix VRSession::viewMatrix(osg::Vec3 position, osg::Quat orientation)
     {
-        MWVR::Pose pose{};
+        position = position * Environment::get().unitsPerMeter();
-        pose = predictedPoses(phase).view[(int)side].pose;
-
-
-        if (MWBase::Environment::get().getStateManager()->getState() == MWBase::StateManager::State_NoGame)
-        {
-            pose = predictedPoses(phase).eye[(int)side];
-            osg::Vec3 position = pose.position * Environment::get().unitsPerMeter();
-            osg::Quat orientation = pose.orientation;
-            osg::Vec3d forward = orientation * osg::Vec3d(0, 1, 0);
-            osg::Vec3d up = orientation * osg::Vec3d(0, 0, 1);
-            osg::Matrix viewMatrix;
-            viewMatrix.makeLookAt(position, position + forward, up);
-
-            return viewMatrix;
-        }
-
-        osg::Vec3 position = pose.position * Environment::get().unitsPerMeter();
-        osg::Quat orientation = pose.orientation;
 
         float y = position.y();
         float z = position.z();
@@ -106,10 +88,30 @@ namespace MWVR
         osg::Matrix viewMatrix;
         viewMatrix.setTrans(-position);
         viewMatrix.postMultRotate(orientation.conj());
+        return viewMatrix;
+    }
+
+    osg::Matrix VRSession::viewMatrix(FramePhase phase, Side side)
+    {
+        MWVR::Pose pose{};
+        pose = predictedPoses(phase).view[(int)side].pose;
+
+        if (MWBase::Environment::get().getStateManager()->getState() == MWBase::StateManager::State_NoGame)
+        {
+            pose = predictedPoses(phase).eye[(int)side];
+            osg::Vec3 position = pose.position * Environment::get().unitsPerMeter();
+            osg::Quat orientation = pose.orientation;
+            osg::Vec3d forward = orientation * osg::Vec3d(0, 1, 0);
+            osg::Vec3d up = orientation * osg::Vec3d(0, 0, 1);
+            osg::Matrix viewMatrix;
+            viewMatrix.makeLookAt(position, position + forward, up);
 
             return viewMatrix;
         }
         
+        return viewMatrix(pose.position, pose.orientation);
+    }
+
     bool VRSession::isRunning() const {
         auto* xr = Environment::get().getManager();
         return xr->xrSessionRunning();
@@ -228,10 +230,8 @@ namespace MWVR
 
     void VRSession::prepareFrame()
     {
-
         std::unique_lock<std::mutex> lock(mMutex);
         mFrames++;
-        assert(!mPredrawFrame);
 
         auto* xr = Environment::get().getManager();
         xr->handleEvents();
@@ -347,7 +347,6 @@ namespace MWVR
 
     void VRSession::movementAngles(float& yaw, float& pitch)
     {
-        assert(mPredrawFrame);
         if (!getFrame(FramePhase::Update))
             beginPhase(FramePhase::Update);
         auto frameMeta = getFrame(FramePhase::Update).get();
@@ -363,8 +362,6 @@ namespace MWVR
         getEulerAngles(frameMeta->mPredictedPoses.head.orientation, headYaw, headPitch, headsWillRoll);
         getEulerAngles(frameMeta->mPredictedPoses.hands[(int)Side::LEFT_SIDE].orientation, handYaw, handPitch, handRoll);
 
-        //Log(Debug::Verbose) << "lhandViewYaw=" << yaw << ", headYaw=" << headYaw << ", handYaw=" << handYaw << ", diff=" << (handYaw - headYaw);
-        //Log(Debug::Verbose) << "lhandViewPitch=" << pitch << ", headPitch=" << headPitch << ", handPitch=" << handPitch << ", diff=" << (handPitch - headPitch);
         yaw = handYaw - headYaw;
         pitch = handPitch - headPitch;
     }

apps/openmw/mwvr/vrsession.hpp

@@ -73,6 +73,7 @@ namespace MWVR
         float playerScale() const { return mPlayerScale; }
         float setPlayerScale(float scale) { return mPlayerScale = scale; }
 
+        osg::Matrix viewMatrix(osg::Vec3 position, osg::Quat orientation);
         osg::Matrix viewMatrix(FramePhase phase, Side side);
         osg::Matrix projectionMatrix(FramePhase phase, Side side);
 

apps/openmw/mwvr/vrshadow.cpp

@@ -0,0 +1,111 @@
+#include "vrenvironment.hpp"
+#include "vrsession.hpp"
+#include "vrshadow.hpp"
+
+#include "../mwrender/vismask.hpp"
+
+#include <components/sceneutil/mwshadowtechnique.hpp>
+
+#include <cassert>
+
+namespace MWVR
+{
+    VrShadow::VrShadow(osgViewer::Viewer* viewer, int renderOrder)
+        : mViewer(viewer)
+        , mRenderOrder(renderOrder)
+        , mShadowMapCamera(nullptr)
+        , mUpdateCallback(new UpdateShadowMapSlaveCallback)
+        , mMasterConfig(new SharedShadowMapConfig)
+        , mSlaveConfig(new SharedShadowMapConfig)
+    {
+        mMasterConfig->_id = "VR";
+        mMasterConfig->_master = true;
+        mSlaveConfig->_id = "VR";
+        mSlaveConfig->_master = false;
+    }
+
+    void VrShadow::configureShadowsForCamera(osg::Camera* camera)
+    {
+        camera->setUserData(mSlaveConfig);
+        if (camera->getRenderOrderNum() < mRenderOrder)
+            camera->setRenderOrder(camera->getRenderOrder(), mRenderOrder + 1);
+    }
+
+    void VrShadow::configureShadows(bool enabled)
+    {
+        if (enabled)
+        {
+            if (!mShadowMapCamera)
+            {
+                mShadowMapCamera = new osg::Camera();
+                mShadowMapCamera->setName("ShadowMap");
+                mShadowMapCamera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+                mShadowMapCamera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
+                mShadowMapCamera->setRenderOrder(osg::Camera::PRE_RENDER, mRenderOrder);
+                mShadowMapCamera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
+                mShadowMapCamera->setAllowEventFocus(false);
+                mShadowMapCamera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
+                mShadowMapCamera->setViewport(0, 0, 640, 360);
+                mShadowMapCamera->setGraphicsContext(mViewer->getCamera()->getGraphicsContext());
+                mShadowMapCamera->setCullMask(0);
+                mShadowMapCamera->setUserData(mMasterConfig);
+                mViewer->addSlave(mShadowMapCamera, true);
+                auto* slave = mViewer->findSlaveForCamera(mShadowMapCamera);
+                assert(slave);
+                slave->_updateSlaveCallback = mUpdateCallback;
+            }
+
+        }
+        else
+        {
+            if (mShadowMapCamera)
+            {
+                mViewer->removeSlave(mViewer->findSlaveIndexForCamera(mShadowMapCamera));
+                mShadowMapCamera = nullptr;
+            }
+        }
+    }
+
+    void UpdateShadowMapSlaveCallback::updateSlave(osg::View& view, osg::View::Slave& slave)
+    {
+        auto* camera = slave._camera.get();
+        auto* session = Environment::get().getSession();
+        auto viewMatrix = view.getCamera()->getViewMatrix();
+
+        auto& poses = session->predictedPoses(VRSession::FramePhase::Update);
+        auto& leftView = poses.view[(int)Side::LEFT_SIDE];
+        auto& rightView = poses.view[(int)Side::RIGHT_SIDE];
+        osg::Vec3d leftEye = leftView.pose.position;
+        osg::Vec3d rightEye = rightView.pose.position;
+
+        // The shadow map will be computed from a position P slightly behind the eyes L and R
+        // where it creates the minimum frustum encompassing both eyes' frustums.
+
+        // Compute Frustum angles. A simple min/max.
+        FieldOfView fov;
+        fov.angleLeft = std::min(leftView.fov.angleLeft, rightView.fov.angleLeft);
+        fov.angleRight = std::max(leftView.fov.angleRight, rightView.fov.angleRight);
+        fov.angleDown = std::min(leftView.fov.angleDown, rightView.fov.angleDown);
+        fov.angleUp = std::max(leftView.fov.angleUp, rightView.fov.angleUp);
+
+        // Use the law of sines on the triangle spanning PLR to determine P
+        double angleLeft = std::abs(fov.angleLeft);
+        double angleRight = std::abs(fov.angleRight);
+        double lengthRL = (rightEye - leftEye).length();
+        double ratioRL = lengthRL / std::sin(osg::PI - angleLeft - angleRight);
+        double lengthLP = ratioRL * std::sin(angleRight);
+        osg::Vec3d directionLP = osg::Vec3(std::cos(-angleLeft), std::sin(-angleLeft), 0);
+        osg::Vec3d P = leftEye + directionLP * lengthLP;
+
+        // Generate the matrices
+        float near_ = Settings::Manager::getFloat("near clip", "Camera");
+        float far_ = Settings::Manager::getFloat("viewing distance", "Camera");
+
+        auto modifiedViewMatrix = viewMatrix * session->viewMatrix(P, osg::Quat(0, 0, 0, 1));
+        auto projectionMatrix = fov.perspectiveMatrix(near_, far_);
+
+        camera->setViewMatrix(modifiedViewMatrix);
+        camera->setProjectionMatrix(projectionMatrix);
+        slave.updateSlaveImplementation(view);
+    }
+}

apps/openmw/mwvr/vrshadow.hpp

@@ -0,0 +1,38 @@
+#ifndef MWVR_VRSHADOW_H
+#define MWVR_VRSHADOW_H
+
+#include <osg/Camera>
+#include <osgViewer/Viewer>
+
+#include <components/sceneutil/mwshadowtechnique.hpp>
+
+namespace MWVR
+{
+
+    class UpdateShadowMapSlaveCallback : public osg::View::Slave::UpdateSlaveCallback
+    {
+    public:
+        void updateSlave(osg::View& view, osg::View::Slave& slave) override;
+    };
+
+    class VrShadow
+    {
+        using SharedShadowMapConfig = SceneUtil::MWShadowTechnique::SharedShadowMapConfig;
+    public:
+        VrShadow(osgViewer::Viewer* viewer, int renderOrder = 0);
+
+        void configureShadowsForCamera(osg::Camera* camera);
+
+        void configureShadows(bool enabled);
+
+    private:
+        osgViewer::Viewer* mViewer;
+        int mRenderOrder;
+        osg::ref_ptr<osg::Camera> mShadowMapCamera;
+        osg::ref_ptr< UpdateShadowMapSlaveCallback > mUpdateCallback;
+        osg::ref_ptr<SharedShadowMapConfig> mMasterConfig;
+        osg::ref_ptr<SharedShadowMapConfig> mSlaveConfig;
+    };
+}
+
+#endif

apps/openmw/mwvr/vrview.cpp

@@ -36,13 +36,13 @@ namespace MWVR {
         }
     };
 
-    osg::Camera* VRView::createCamera(int eye, const osg::Vec4& clearColor, osg::GraphicsContext* gc)
+    osg::Camera* VRView::createCamera(int order, const osg::Vec4& clearColor, osg::GraphicsContext* gc)
     {
         osg::ref_ptr<osg::Camera> camera = new osg::Camera();
         camera->setClearColor(clearColor);
         camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
         camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
-        camera->setRenderOrder(osg::Camera::PRE_RENDER, eye + 2);
+        camera->setRenderOrder(osg::Camera::PRE_RENDER, order);
         camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
         camera->setAllowEventFocus(false);
         camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);

apps/openmw/mwvr/vrview.hpp

@@ -1,5 +1,5 @@
-#ifndef OPENXR_VIEW_HPP
+#ifndef MWVR_VRVIEW_H
-#define OPENXR_VIEW_HPP
+#define MWVR_VRVIEW_H
 
 #include <cassert>
 #include "openxrmanager.hpp"

apps/openmw/mwvr/vrviewer.cpp

@@ -8,6 +8,10 @@
 
 #include "../mwrender/vismask.hpp"
 
+#include <osgViewer/Renderer>
+
+#include <components/sceneutil/mwshadowtechnique.hpp>
+
 namespace MWVR
 {
 
@@ -32,6 +36,7 @@ namespace MWVR
         : mViewer(viewer)
         , mPreDraw(new PredrawCallback(this))
         , mPostDraw(new PostdrawCallback(this))
+        , mVrShadow(viewer, 1)
         , mConfigured(false)
     {
         mViewer->setRealizeOperation(new RealizeOperation());
@@ -81,14 +86,17 @@ namespace MWVR
         osg::Vec4 clearColor = mainCamera->getClearColor();
         auto config = xr->getRecommendedSwapchainConfig();
         bool mirror = Settings::Manager::getBool("mirror texture", "VR");
+        mFlipMirrorTextureOrder = Settings::Manager::getBool("flip mirror texture order", "VR");
         // TODO: If mirror is false either hide the window or paste something meaningful into it.
         // E.g. Fanart of Dagoth UR wearing a VR headset
 
+        mVrShadow.configureShadows(Settings::Manager::getBool("enable shadows", "Shadows"));
+
         for (unsigned i = 0; i < sViewNames.size(); i++)
         {
             auto view = new VRView(sViewNames[i], config[i], context->getState());
             mViews[sViewNames[i]] = view;
-            auto camera = mCameras[sViewNames[i]] = view->createCamera(i, clearColor, context);
+            auto camera = mCameras[sViewNames[i]] = view->createCamera(i + 2, clearColor, context);
             camera->setPreDrawCallback(mPreDraw);
             camera->setFinalDrawCallback(mPostDraw);
             camera->setCullMask(~MWRender::Mask_GUI & ~MWRender::Mask_SimpleWater & ~MWRender::Mask_UpdateVisitor);
@@ -97,13 +105,17 @@ namespace MWVR
                 camera->setSmallFeatureCullingPixelSize(smallFeatureCullingPixelSize);
             camera->setCullingMode(cullingMode);
             mViewer->addSlave(camera, true);
-            mViewer->getSlave(i)._updateSlaveCallback = new VRView::UpdateSlaveCallback(view, context);
+            auto* slave = mViewer->findSlaveForCamera(camera);
+            assert(slave);
+            slave->_updateSlaveCallback = new VRView::UpdateSlaveCallback(view, context);
 
             if (mirror)
                 mMsaaResolveMirrorTexture[i].reset(new VRFramebuffer(context->getState(),
                     view->swapchain().width(),
                     view->swapchain().height(),
                     0));
+
+            mVrShadow.configureShadowsForCamera(camera);
         }
 
         if (mirror)
@@ -156,8 +168,10 @@ namespace MWVR
             resolveTexture.bindFramebuffer(gc, GL_FRAMEBUFFER_EXT);
             mViews[sViewNames[i]]->swapchain().renderBuffer()->blit(gc, 0, 0, resolveTexture.width(), resolveTexture.height());
             mMirrorTexture->bindFramebuffer(gc, GL_FRAMEBUFFER_EXT);
-            // Mirror the index when rendering to the mirror texture to allow cross eye mirror textures.
+
-            unsigned mirrorIndex = sViewNames.size() - 1 - i;
+            unsigned mirrorIndex = i;
+            if (mFlipMirrorTextureOrder)
+                mirrorIndex = sViewNames.size() - 1 - i;
             resolveTexture.blit(gc, mirrorIndex * mirrorWidth, 0, (mirrorIndex + 1) * mirrorWidth, screenHeight);
         }
 

apps/openmw/mwvr/vrviewer.hpp

@@ -1,5 +1,5 @@
-#ifndef MWVR_OPENRXVIEWER_H
+#ifndef MWVR_VRVIEWER_H
-#define MWVR_OPENRXVIEWER_H
+#define MWVR_VRVIEWER_H
 
 #include <memory>
 #include <array>
@@ -10,6 +10,7 @@
 #include <osgViewer/Viewer>
 
 #include "openxrmanager.hpp"
+#include "vrshadow.hpp"
 
 #include <components/sceneutil/positionattitudetransform.hpp>
 
@@ -92,10 +93,12 @@ namespace MWVR
         osg::GraphicsContext* mMainCameraGC{ nullptr };
         std::unique_ptr<VRFramebuffer> mMsaaResolveMirrorTexture[2]{ };
         std::unique_ptr<VRFramebuffer> mMirrorTexture{ nullptr };
+        VrShadow    mVrShadow;
 
-        std::mutex mMutex;
+        std::mutex mMutex{};
 
         bool mConfigured{ false };
+        bool mFlipMirrorTextureOrder{ false };
     };
 }
 

components/sceneutil/mwshadowtechnique.cpp

@@ -900,6 +900,75 @@ MWShadowTechnique::ViewDependentData* MWShadowTechnique::getViewDependentData(os
     return vdd.release();
 }
 
+MWShadowTechnique::ViewDependentData* MWShadowTechnique::getSharedVdd(const SharedShadowMapConfig& config)
+{
+    auto it = _viewDependentDataShareMap.find(config._id);
+    if (it != _viewDependentDataShareMap.end())
+        return it->second;
+
+    return nullptr;
+}
+
+void MWShadowTechnique::addSharedVdd(const SharedShadowMapConfig& config, ViewDependentData* vdd)
+{
+    _viewDependentDataShareMap[config._id] = vdd;
+}
+
+void SceneUtil::MWShadowTechnique::shareShadowMap(osgUtil::CullVisitor& cv, ViewDependentData* lhs, ViewDependentData* rhs)
+{
+    // Prepare for rendering shadows using the shadow map owned by rhs.
+
+    // To achieve this i first copy all data that is not specific to this cv's camera and thus read-only,
+    // trusting openmw and osg won't overwrite that data before this frame is done rendering.
+    // This works due to the double buffering of CullVisitors by osg, but also requires that cull passes are serialized (relative to one another).
+    // Then initialize new copies of the data that will be written with view-specific data 
+    // (the stateset and the texgens).
+
+    lhs->_viewDependentShadowMap = rhs->_viewDependentShadowMap;
+    lhs->_stateset->clear();
+    lhs->_lightDataList = rhs->_lightDataList;
+    lhs->_numValidShadows = rhs->_numValidShadows;
+
+    ShadowDataList& sdl = lhs->getShadowDataList();
+    ShadowDataList previous_sdl;
+    previous_sdl.swap(sdl);
+    for (auto rhs_sd : rhs->getShadowDataList())
+    {
+        osg::ref_ptr<ShadowData> lhs_sd;
+
+        if (previous_sdl.empty())
+        {
+            OSG_INFO << "Create new ShadowData" << std::endl;
+            lhs_sd = new ShadowData(lhs);
+        }
+        else
+        {
+            OSG_INFO << "Taking ShadowData from from of previous_sdl" << std::endl;
+            lhs_sd = previous_sdl.front();
+            previous_sdl.erase(previous_sdl.begin());
+        }
+        lhs_sd->_camera = rhs_sd->_camera;
+        lhs_sd->_textureUnit = rhs_sd->_textureUnit;
+        lhs_sd->_texture = rhs_sd->_texture;
+        sdl.push_back(lhs_sd);
+    }
+
+
+    cv.pushStateSet(_shadowRecievingPlaceholderStateSet.get());
+    osg::ref_ptr<osgUtil::StateGraph> decoratorStateGraph = cv.getCurrentStateGraph();
+    cullShadowReceivingScene(&cv);
+    cv.popStateSet();
+
+    for (auto sd : sdl)
+    {
+        assignTexGenSettings(&cv, sd->_camera, sd->_textureUnit, sd->_texgen.get());
+    }
+    if (lhs->numValidShadows() > 0)
+    {
+        decoratorStateGraph->setStateSet(selectStateSetForRenderingShadow(*lhs));
+    }
+}
+
 void MWShadowTechnique::update(osg::NodeVisitor& nv)
 {
     OSG_INFO<<"MWShadowTechnique::update(osg::NodeVisitor& "<<&nv<<")"<<std::endl;
@@ -925,6 +994,29 @@ void MWShadowTechnique::cull(osgUtil::CullVisitor& cv)
 
     ViewDependentData* vdd = getViewDependentData(&cv);
 
+    // Use shared shadow map if applicable
+    auto* sharedConfig = dynamic_cast<SharedShadowMapConfig*>(cv.getCurrentCamera()->getUserData());
+    if (sharedConfig)
+    {
+        if (sharedConfig->_master)
+        {
+            addSharedVdd(*sharedConfig, vdd);
+        }
+        else
+        {
+            auto* sharedVdd = getSharedVdd(*sharedConfig);
+            if (sharedVdd)
+            {
+                OSG_INFO << "Using shared shadow map" << std::endl;
+                return shareShadowMap(cv, vdd, sharedVdd);
+            }
+            else
+            {
+                OSG_INFO << "Warning, view configured to reuse shared shadow map but no shadow map has been shared. Shadows will be generated instead." << std::endl;
+            }
+        }
+    }
+
     if (!vdd)
     {
         OSG_INFO<<"Warning, now ViewDependentData created, unable to create shadows."<<std::endl;
@@ -1397,6 +1489,7 @@ void MWShadowTechnique::cull(osgUtil::CullVisitor& cv)
                 _debugHud->draw(sd->_texture, sm_i, camera->getViewMatrix() * camera->getProjectionMatrix(), cv);
         }
     }
+    vdd->setNumValidShadows(numValidShadows);
 
     if (numValidShadows>0)
     {

components/sceneutil/mwshadowtechnique.hpp

@@ -139,6 +139,17 @@ namespace SceneUtil {
         // forward declare
         class ViewDependentData;
 
+        /// Configuration of shadow maps shared by multiple views
+        struct SharedShadowMapConfig : public osg::Referenced
+        {
+            virtual ~SharedShadowMapConfig() {}
+
+            /// String identifier of the shared shadow map
+            std::string _id;
+
+            bool _master;
+        };
+
         struct LightData : public osg::Referenced
         {
             LightData(ViewDependentData* vdd);
@@ -193,7 +204,12 @@ namespace SceneUtil {
 
             virtual void releaseGLObjects(osg::State* = 0) const;
 
+            unsigned int numValidShadows(void) const { return _numValidShadows; }
+
+            void setNumValidShadows(unsigned int numValidShadows) { _numValidShadows = numValidShadows; }
+
         protected:
+            friend class MWShadowTechnique;
             virtual ~ViewDependentData() {}
 
             MWShadowTechnique*          _viewDependentShadowMap;
@@ -202,11 +218,16 @@ namespace SceneUtil {
 
             LightDataList               _lightDataList;
             ShadowDataList              _shadowDataList;
+
+            unsigned int _numValidShadows;
         };
 
         virtual ViewDependentData* createViewDependentData(osgUtil::CullVisitor* cv);
 
         ViewDependentData* getViewDependentData(osgUtil::CullVisitor* cv);
+        ViewDependentData* getSharedVdd(const SharedShadowMapConfig& config);
+        void addSharedVdd(const SharedShadowMapConfig& config, ViewDependentData* vdd);
+        void shareShadowMap(osgUtil::CullVisitor& cv, ViewDependentData* lhs, ViewDependentData* rhs);
 
 
 
@@ -234,8 +255,10 @@ namespace SceneUtil {
         virtual ~MWShadowTechnique();
 
         typedef std::map< osgUtil::CullVisitor*, osg::ref_ptr<ViewDependentData> >  ViewDependentDataMap;
+        typedef std::map< std::string, osg::ref_ptr<ViewDependentData> >            ViewDependentDataShareMap;
         mutable OpenThreads::Mutex              _viewDependentDataMapMutex;
         ViewDependentDataMap                    _viewDependentDataMap;
+        ViewDependentDataShareMap               _viewDependentDataShareMap;
 
         osg::ref_ptr<osg::StateSet>             _shadowRecievingPlaceholderStateSet;
 

files/settings-default.cfg

@@ -896,3 +896,6 @@ realistic combat maximum swing velocity = 4.0
 
 # Enables controller vibrations when you hit or are hit.
 haptics enabled = true
+
+# Flip the order of eyes in the mirror texture (to allow cross eyed view)
+flip mirror texture order = false