From f4898539e9c99f0f2c4a36c0f47bf0f90dcc0290 Mon Sep 17 00:00:00 2001
From: scrawl <scrawl@baseoftrash.de>
Date: Sat, 24 Mar 2012 13:06:01 +0100
Subject: [PATCH] added some code that doesn't do anything yet, waiting for
 ogre 1.8

---
 apps/openmw/CMakeLists.txt                |  2 +-
 apps/openmw/mwrender/occlusionquery.cpp   | 27 +++++++++++++++++++++++
 apps/openmw/mwrender/occlusionquery.hpp   | 27 +++++++++++++++++++++++
 apps/openmw/mwrender/renderingmanager.cpp |  3 +++
 apps/openmw/mwrender/renderingmanager.hpp |  7 ++++--
 5 files changed, 63 insertions(+), 3 deletions(-)
 create mode 100644 apps/openmw/mwrender/occlusionquery.cpp
 create mode 100644 apps/openmw/mwrender/occlusionquery.hpp

diff --git a/apps/openmw/CMakeLists.txt b/apps/openmw/CMakeLists.txt
index 2630098f5..7d4836d3b 100644
--- a/apps/openmw/CMakeLists.txt
+++ b/apps/openmw/CMakeLists.txt
@@ -15,7 +15,7 @@ source_group(game FILES ${GAME} ${GAME_HEADER})
 
 add_openmw_dir (mwrender
     renderingmanager debugging sky player animation npcanimation creatureanimation actors objects
-    renderinginterface localmap
+    renderinginterface localmap occlusionquery
     )
 
 add_openmw_dir (mwinput
diff --git a/apps/openmw/mwrender/occlusionquery.cpp b/apps/openmw/mwrender/occlusionquery.cpp
new file mode 100644
index 000000000..395660bb5
--- /dev/null
+++ b/apps/openmw/mwrender/occlusionquery.cpp
@@ -0,0 +1,27 @@
+#include "occlusionquery.hpp"
+
+#include <OgreRenderSystem.h>
+#include <OgreRoot.h>
+
+using namespace MWRender;
+using namespace Ogre;
+
+OcclusionQuery::OcclusionQuery() :
+    mSunTotalAreaQuery(0), mSunVisibleAreaQuery(0)
+{
+    try {
+        RenderSystem* renderSystem = Root::getSingleton().getRenderSystem();
+
+        mSunTotalAreaQuery = renderSystem->createHardwareOcclusionQuery();
+        mSunVisibleAreaQuery = renderSystem->createHardwareOcclusionQuery();
+
+        mSupported = (mSunTotalAreaQuery != 0) && (mSunVisibleAreaQuery != 0);
+    }
+    catch (Ogre::Exception e)
+    {
+        mSupported = false;
+    }
+
+    if (!mSupported)
+        std::cout << "Hardware occlusion queries not supported." << std::endl;
+}
diff --git a/apps/openmw/mwrender/occlusionquery.hpp b/apps/openmw/mwrender/occlusionquery.hpp
new file mode 100644
index 000000000..619b072ee
--- /dev/null
+++ b/apps/openmw/mwrender/occlusionquery.hpp
@@ -0,0 +1,27 @@
+#ifndef _GAME_OCCLUSION_QUERY_H
+#define _GAME_OCCLUSION_QUERY_H
+
+#include <OgreHardwareOcclusionQuery.h>
+
+namespace MWRender
+{
+    ///
+    /// \brief Implements hardware occlusion queries on the GPU
+    ///
+    class OcclusionQuery
+    {
+    public:
+        OcclusionQuery();
+
+        bool supported();
+        ///< returns true if occlusion queries are supported on the user's hardware
+
+    private:
+        Ogre::HardwareOcclusionQuery* mSunTotalAreaQuery;
+        Ogre::HardwareOcclusionQuery* mSunVisibleAreaQuery;
+
+        bool mSupported;
+    };
+}
+
+#endif
diff --git a/apps/openmw/mwrender/renderingmanager.cpp b/apps/openmw/mwrender/renderingmanager.cpp
index e2aea19c6..78287dadb 100644
--- a/apps/openmw/mwrender/renderingmanager.cpp
+++ b/apps/openmw/mwrender/renderingmanager.cpp
@@ -49,6 +49,8 @@ RenderingManager::RenderingManager (OEngine::Render::OgreRenderer& _rend, const
     Ogre::SceneNode *cameraYawNode = playerNode->createChildSceneNode();
     Ogre::SceneNode *cameraPitchNode = cameraYawNode->createChildSceneNode();
     cameraPitchNode->attachObject(mRendering.getCamera());
+
+    mOcclusionQuery = new OcclusionQuery();
     
     //mSkyManager = 0;
     mSkyManager = new SkyManager(mMwRoot, mRendering.getCamera(), &environment);
@@ -65,6 +67,7 @@ RenderingManager::~RenderingManager ()
     delete mPlayer;
     delete mSkyManager;
     delete mLocalMap;
+    delete mOcclusionQuery;
 }
 
 MWRender::SkyManager* RenderingManager::getSkyManager()
diff --git a/apps/openmw/mwrender/renderingmanager.hpp b/apps/openmw/mwrender/renderingmanager.hpp
index 78a1d2fdb..996396633 100644
--- a/apps/openmw/mwrender/renderingmanager.hpp
+++ b/apps/openmw/mwrender/renderingmanager.hpp
@@ -25,6 +25,7 @@
 #include "actors.hpp"
 #include "player.hpp"
 #include "localmap.hpp"
+#include "occlusionquery.hpp"
 
 namespace Ogre
 {
@@ -131,9 +132,11 @@ class RenderingManager: private RenderingInterface {
   private:
 
     void setAmbientMode();
-    
+
     SkyManager* mSkyManager;
-    
+
+    OcclusionQuery* mOcclusionQuery;
+
     OEngine::Render::OgreRenderer &mRendering;
 
     MWRender::Objects mObjects;