From 50e5aa897648246c253b59313a288c294faf9f12 Mon Sep 17 00:00:00 2001
From: Nikolay Kasyanov <corrmage@gmail.com>
Date: Sun, 16 Jun 2013 16:25:13 +0400
Subject: [PATCH] Custom rendering loop on OS X again. Prevents default Ogre
 message pump from stealing input events.

---
 libs/openengine/ogre/renderer.cpp | 34 ++++++++++++++++++++++++++++++-
 libs/openengine/ogre/renderer.hpp | 21 +++++++++++++++++++
 2 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/libs/openengine/ogre/renderer.cpp b/libs/openengine/ogre/renderer.cpp
index e3bba8bfa2..72a02142f4 100644
--- a/libs/openengine/ogre/renderer.cpp
+++ b/libs/openengine/ogre/renderer.cpp
@@ -23,13 +23,29 @@
 #include <cstdlib>
 #include <stdexcept>
 
-#ifdef __MACOSX__
+#if OGRE_PLATFORM == OGRE_PLATFORM_APPLE
 #include "osx_utils.h"
 #endif
 
 using namespace Ogre;
 using namespace OEngine::Render;
 
+
+#if OGRE_PLATFORM == OGRE_PLATFORM_APPLE
+
+CustomRoot::CustomRoot(const Ogre::String& pluginFileName, 
+                    const Ogre::String& configFileName, 
+                    const Ogre::String& logFileName)
+: Ogre::Root(pluginFileName, configFileName, logFileName)
+{}
+
+bool CustomRoot::isQueuedEnd() const
+{
+    return mQueuedEnd;
+}
+
+#endif
+
 void OgreRenderer::cleanup()
 {
     delete mFader;
@@ -52,7 +68,19 @@ void OgreRenderer::cleanup()
 
 void OgreRenderer::start()
 {
+#if OGRE_PLATFORM == OGRE_PLATFORM_APPLE
+    // we need this custom main loop because otherwise Ogre's Carbon message pump will
+    // steal input events even from our Cocoa window
+    // There's no way to disable Ogre's message pump other that comment pump code in Ogre's source
+    do {
+        if (!mRoot->renderOneFrame()) {
+            break;
+        }
+
+    } while (!mRoot->isQueuedEnd());
+#else
     mRoot->startRendering();
+#endif
 }
 
 void OgreRenderer::loadPlugins() 
@@ -145,7 +173,11 @@ void OgreRenderer::configure(const std::string &logPath,
         // Disable logging
         log->setDebugOutputEnabled(false);
 
+#if defined(__APPLE__) && !defined(__LP64__)
+    mRoot = new CustomRoot("", "", "");
+#else
     mRoot = new Root("", "", "");
+#endif
 
     #if defined(ENABLE_PLUGIN_GL) || defined(ENABLE_PLUGIN_Direct3D9) || defined(ENABLE_PLUGIN_CgProgramManager) || defined(ENABLE_PLUGIN_OctreeSceneManager) || defined(ENABLE_PLUGIN_ParticleFX)
     loadPlugins();
diff --git a/libs/openengine/ogre/renderer.hpp b/libs/openengine/ogre/renderer.hpp
index 0cd0e74e83..a451490fbd 100644
--- a/libs/openengine/ogre/renderer.hpp
+++ b/libs/openengine/ogre/renderer.hpp
@@ -27,12 +27,18 @@
 #include "OgreTexture.h"
 #include <OgreWindowEventUtilities.h>
 
+#if OGRE_PLATFORM == OGRE_PLATFORM_APPLE
+#include <OgreRoot.h>
+#endif
+
 struct SDL_Window;
 struct SDL_Surface;
 
 namespace Ogre
 {
+#if OGRE_PLATFORM != OGRE_PLATFORM_APPLE
     class Root;
+#endif
     class RenderWindow;
     class SceneManager;
     class Camera;
@@ -54,11 +60,26 @@ namespace OEngine
             std::string icon;
         };
 
+#if OGRE_PLATFORM == OGRE_PLATFORM_APPLE
+        class CustomRoot : public Ogre::Root {
+        public:
+            bool isQueuedEnd() const;
+
+            CustomRoot(const Ogre::String& pluginFileName = "plugins.cfg", 
+                    const Ogre::String& configFileName = "ogre.cfg", 
+                    const Ogre::String& logFileName = "Ogre.log");
+        };
+#endif
+
         class Fader;
 
         class OgreRenderer
         {
+#if OGRE_PLATFORM == OGRE_PLATFORM_APPLE
+            CustomRoot *mRoot;
+#else
             Ogre::Root *mRoot;
+#endif
             Ogre::RenderWindow *mWindow;
             SDL_Window *mSDLWindow;
             SDL_Surface *mWindowIconSurface;