Stop rendering when the window is minimized

apps/openmw/engine.cpp

@@ -92,10 +92,11 @@ void OMW::Engine::frame(float frametime)
         // update input
         mEnvironment.getInputManager()->update(frametime, false);
 
-        // When the window is minimized, pause everything. Currently this *has* to be here to work around a MyGUI bug.
-        // If we are not currently rendering, then RenderItems will not be reused resulting in a memory leak upon changing widget textures.
-        //if (!mOgre->getWindow()->isActive() || !mOgre->getWindow()->isVisible())
-        //    return true;
+        // When the window is minimized, pause the game. Currently this *has* to be here to work around a MyGUI bug.
+        // If we are not currently rendering, then RenderItems will not be reused resulting in a memory leak upon changing widget textures (fixed in MyGUI 3.3.2),
+        // and destroyed widgets will not be deleted (not fixed yet, https://github.com/MyGUI/mygui/issues/21)
+        if (!mEnvironment.getInputManager()->isWindowVisible())
+            return;
 
         // sound
         if (mUseSound)
@@ -689,9 +690,16 @@ void OMW::Engine::go()
 
         frame(dt);
 
-        mViewer->eventTraversal();
-        mViewer->updateTraversal();
-        mViewer->renderingTraversals();
+        if (!mEnvironment.getInputManager()->isWindowVisible())
+        {
+            OpenThreads::Thread::microSleep(5000);
+        }
+        else
+        {
+            mViewer->eventTraversal();
+            mViewer->updateTraversal();
+            mViewer->renderingTraversals();
+        }
     }
 
     // Save user settings

apps/openmw/mwbase/inputmanager.hpp

@@ -25,6 +25,8 @@ namespace MWBase
 
             virtual ~InputManager() {}
 
+            virtual bool isWindowVisible() = 0;
+
             virtual void update(float dt, bool disableControls, bool disableEvents=false) = 0;
 
             virtual void changeInputMode(bool guiMode) = 0;

apps/openmw/mwinput/inputmanagerimp.cpp

@@ -41,6 +41,7 @@ namespace MWInput
             const std::string& userFile, bool userFileExists,
             const std::string& controllerBindingsFile, bool grab)
         : mWindow(window)
+        , mWindowVisible(true)
         , mViewer(viewer)
         , mJoystickLastUsed(false)
         , mPlayer(NULL)
@@ -156,6 +157,11 @@ namespace MWInput
         delete mVideoWrapper;
     }
 
+    bool InputManager::isWindowVisible()
+    {
+        return mWindowVisible;
+    }
+
     void InputManager::setPlayerControlsEnabled(bool enabled)
     {
         int nPlayerChannels = 17;
@@ -850,7 +856,7 @@ namespace MWInput
 
     void InputManager::windowVisibilityChange(bool visible)
     {
-        //TODO: Pause game?
+        mWindowVisible = visible;
     }
 
     void InputManager::windowResized(int x, int y)

apps/openmw/mwinput/inputmanagerimp.hpp

@@ -83,6 +83,8 @@ namespace MWInput
 
         virtual ~InputManager();
 
+        virtual bool isWindowVisible();
+
         /// Clear all savegame-specific data
         virtual void clear();
 
@@ -153,6 +155,7 @@ namespace MWInput
 
     private:
         SDL_Window* mWindow;
+        bool mWindowVisible;
         osg::ref_ptr<osgViewer::Viewer> mViewer;
 
         bool mJoystickLastUsed;