Fix switching to desktop from OpenXR

plugins/openxr/src/OpenXrContext.cpp

@@ -390,6 +390,7 @@ bool OpenXrContext::updateSessionState(XrSessionState newState) {
                 _isSessionRunning = true;
             }
             _shouldRunFrameCycle = true;
+            _isValid = true;
             break;
         }
 
@@ -414,6 +415,7 @@ bool OpenXrContext::updateSessionState(XrSessionState newState) {
             _shouldQuit = true;
             _shouldRunFrameCycle = false;
             _session = XR_NULL_HANDLE;
+            _isValid = false;
             qCDebug(xr_context_cat, "Destroyed session");
             break;
         }
@@ -433,6 +435,7 @@ bool OpenXrContext::pollEvents() {
                 const auto& instanceLossPending = *reinterpret_cast<XrEventDataInstanceLossPending*>(&event);
                 qCCritical(xr_context_cat, "Instance loss pending at %lu! Destroying instance.", instanceLossPending.lossTime);
                 _shouldQuit = true;
+                _isValid = false;
                 continue;
             }
             case XR_TYPE_EVENT_DATA_SESSION_STATE_CHANGED: {
@@ -480,6 +483,7 @@ bool OpenXrContext::pollEvents() {
 
     if (result != XR_EVENT_UNAVAILABLE) {
         qCCritical(xr_context_cat, "Failed to poll events!");
+        _isValid = false;
         return false;
     }
 

plugins/openxr/src/OpenXrContext.h

@@ -61,8 +61,10 @@ public:
     controller::Pose _lastHeadPose;
     std::optional<XrTime> _lastPredictedDisplayTime;
 
+    bool _isValid = true; // set to false when the context is lost
     bool _shouldQuit = false;
     bool _shouldRunFrameCycle = false;
+    bool _isDisplayActive = false;
 
     bool _isSupported = false;
 

plugins/openxr/src/OpenXrDisplayPlugin.cpp

@@ -33,7 +33,7 @@ OpenXrDisplayPlugin::OpenXrDisplayPlugin(std::shared_ptr<OpenXrContext> c) {
 }
 
 bool OpenXrDisplayPlugin::isSupported() const {
-    return _context->_isSupported;
+    return _context->_isValid && _context->_isSupported;
 }
 
 // Slightly differs from glm::ortho
@@ -263,25 +263,15 @@ const QString OpenXrDisplayPlugin::getName() const {
 }
 
 bool OpenXrDisplayPlugin::internalActivate() {
+    if (!_context->_isValid) { return false; }
+
     _context->reset();
+    _context->_isDisplayActive = true;
     return HmdDisplayPlugin::internalActivate();
 }
 
 void OpenXrDisplayPlugin::internalDeactivate() {
-    // We can get into a state where activate -> deactivate -> activate is called in a chain.
+    _context->_isDisplayActive = false;
-    // We are probably gonna have a bad time then. At least check if the session is already running.
-    // This happens when the application decides to switch display plugins back and forth. This should
-    // probably be fixed there.
-    if (_context->_isSessionRunning) {
-        if (!_context->requestExitSession()) {
-            qCCritical(xr_display_cat, "Failed to request exit session");
-        } else {
-            // Poll events until runtime wants to quit
-            while (!_context->_shouldQuit) {
-                _context->pollEvents();
-            }
-        }
-    }
     HmdDisplayPlugin::internalDeactivate();
 }
 
@@ -326,6 +316,11 @@ void OpenXrDisplayPlugin::resetSensors() {
 }
 
 bool OpenXrDisplayPlugin::beginFrameRender(uint32_t frameIndex) {
+    if (!_context->_isValid) {
+        deactivate();
+        return false;
+    }
+
     _context->pollEvents();
 
     if (_context->_shouldQuit) {
@@ -366,6 +361,11 @@ void OpenXrDisplayPlugin::compositeLayers() {
 }
 
 void OpenXrDisplayPlugin::hmdPresent() {
+    if (!_context->_isValid) {
+        deactivate();
+        return;
+    }
+
     if (!_context->_shouldRunFrameCycle) {
         qCWarning(xr_display_cat, "hmdPresent: Shouldn't run frame cycle. Skipping renderin frame %d",
                   _currentFrame->frameIndex);
@@ -464,6 +464,11 @@ bool OpenXrDisplayPlugin::isHmdMounted() const {
 }
 
 void OpenXrDisplayPlugin::updatePresentPose() {
+    if (!_context->_isValid) {
+        deactivate();
+        return;
+    }
+
     if (_lastFrameState.predictedDisplayTime == 0) { return; }
 
     _context->_lastPredictedDisplayTime = _lastFrameState.predictedDisplayTime;

plugins/openxr/src/OpenXrInputPlugin.cpp

@@ -37,7 +37,7 @@ bool OpenXrInputPlugin::uncalibrate() {
 }
 
 bool OpenXrInputPlugin::isSupported() const {
-    return _context->_isSupported;
+    return _context->_isValid && _context->_isSupported;
 }
 
 // TODO: Config options
@@ -54,6 +54,8 @@ QString OpenXrInputPlugin::configurationLayout() {
 }
 
 bool OpenXrInputPlugin::activate() {
+    if (!_context->_isValid) { return false; }
+
     InputPlugin::activate();
 
     loadSettings();
@@ -80,12 +82,25 @@ void OpenXrInputPlugin::deactivate() {
 }
 
 void OpenXrInputPlugin::pluginUpdate(float deltaTime, const controller::InputCalibrationData& inputCalibrationData) {
-    if (_context->_shouldQuit) {
+    if (_context->_shouldQuit || !_context->_isValid) {
         deactivate();
         return;
     }
 
     auto userInputMapper = DependencyManager::get<controller::UserInputMapper>();
+
+    if (_registeredWithInputMapper && !_context->_isDisplayActive) {
+        userInputMapper->removeDevice(_inputDevice->_deviceID);
+        _registeredWithInputMapper = false;
+        _inputDevice->_poseStateMap.clear();
+        return;
+    } else if (!_registeredWithInputMapper && _context->_isDisplayActive) {
+        userInputMapper->registerDevice(_inputDevice);
+        _registeredWithInputMapper = true;
+    }
+
+    if (!_registeredWithInputMapper) { return; }
+
     userInputMapper->withLock([&, this]() { _inputDevice->update(deltaTime, inputCalibrationData); });
 
     if (_inputDevice->_trackedControllers == 0 && _registeredWithInputMapper) {