source: code/trunk/src/orxonox/GraphicsEngine.cc @ 1052

/*
 *   ORXONOX - the hottest 3D action shooter ever to exist
 *
 *
 *   License notice:
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation; either version 2
 *   of the License, or (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 *   Author:
 *      Benjamin Knecht <beni_at_orxonox.net>, (C) 2007
 *   Co-authors:
 *      Reto Grieder
 *
 */

 /**
    @file orxonox.cc
    @brief Orxonox class
  */

#include "OrxonoxStableHeaders.h"
#include "GraphicsEngine.h"

#include <OgreRoot.h>
#include <OgreException.h>
#include <OgreConfigFile.h>
#include <OgreLogManager.h>
#include <OgreTextureManager.h>
#include <OgreRenderWindow.h>

#include "core/CoreIncludes.h"
#include "core/ConfigValueIncludes.h"
#include "core/Debug.h"


namespace orxonox {

  /**
    @brief Returns the singleton instance and creates it the first time.
    @return The only instance of GraphicsEngine.
  */
  GraphicsEngine& GraphicsEngine::getSingleton()
  {
    static GraphicsEngine theOnlyInstance;
    return theOnlyInstance;
  }

  /**
    @brief Only use constructor to initialise variables and pointers!
  */
  GraphicsEngine::GraphicsEngine()
  {
    RegisterObject(GraphicsEngine);
    //this->bOverwritePath_ = false;
    this->setConfigValues();
    // set to standard values
    this->configPath_ = "";
    this->root_ = 0;
    this->scene_ = 0;
    this->renderWindow_ = 0;
    COUT(4) << "*** GraphicsEngine: Constructed" << std::endl;
  }

  /**
    @brief Called after main() --> call destroyObjects()!
  */
  GraphicsEngine::~GraphicsEngine()
  {
    this->destroy();
  }

  /**
    @brief Destroys all the internal objects. Call this method when you
           normally would call the destructor.
  */
  void GraphicsEngine::destroy()
  {
    COUT(4) << "*** GraphicsEngine: Destroying objects..." << std::endl;
    if (this->root_)
      delete this->root_;
    this->root_ = 0;
    this->scene_ = 0;
    this->renderWindow_ = 0;
    // delete the ogre log and the logManager (since we have created it).
    if (Ogre::LogManager::getSingletonPtr() != 0)
    {
      Ogre::LogManager::getSingleton().getDefaultLog()->removeListener(this);
      Ogre::LogManager::getSingleton().destroyLog(Ogre::LogManager::getSingleton().getDefaultLog());
      delete Ogre::LogManager::getSingletonPtr();
    }
    COUT(4) << "*** GraphicsEngine: Destroying objects done" << std::endl;
  }

  void GraphicsEngine::setConfigValues()
  {
    SetConfigValue(dataPath_, "../../media/").description("relative path to media data");
    SetConfigValue(ogreLogfile_, "ogre.log").description("Logfile for messages from Ogre. Use \"\" to suppress log file creation.");
    SetConfigValue(ogreLogLevelTrivial_ , 5).description("Corresponding orxonox debug level for ogre Trivial");
    SetConfigValue(ogreLogLevelNormal_  , 4).description("Corresponding orxonox debug level for ogre Normal");
    SetConfigValue(ogreLogLevelCritical_, 2).description("Corresponding orxonox debug level for ogre Critical");
  }

  /**
    @brief Creates the Ogre Root object and sets up the ogre log.
  */
  void GraphicsEngine::setup()
  {
    //TODO: Check if file exists (maybe not here)
/*#ifndef OGRE_STATIC_LIB
    root_ = new Ogre::Root(configPath_ + "plugins.cfg", configPath_ + "ogre.cfg",
                     configPath_ + "Ogre.log");
#else
    root_ = new Ogre::Root(NULL, configPath_ + "ogre.cfg", configPath_ + "Ogre.log");
#endif*/
#if ORXONOX_COMPILER == ORXONOX_COMPILER_MSVC && defined(_DEBUG)
    std::string plugin_filename = "plugins_d.cfg";
#else
    std::string plugin_filename = "plugins.cfg";
#endif

    // create a logManager
    /*LogManager *logger;
                if(LogManager::getSingletonPtr() == 0)
                        logger = new LogManager();
    else
      logger = LogManager::getSingletonPtr();
    COUT(4) << "*** GraphicsEngine: Ogre LogManager created/assigned" << std::endl;

    // create our own log that we can listen to
    Log *myLog;
    if (this->ogreLogfile_ == "")
      myLog = logger->createLog("ogre.log", true, false, true);
    else
      myLog = logger->createLog(this->ogreLogfile_, true, false, false);
    COUT(4) << "*** GraphicsEngine: Ogre Log created" << std::endl;

    myLog->setLogDetail(LL_BOREME);
    myLog->addListener(this);*/

    // Root will detect that we've already created a Log
    COUT(4) << "*** GraphicsEngine: Creating Ogre Root..." << std::endl;
    root_ = new Ogre::Root(plugin_filename);
    COUT(4) << "*** GraphicsEngine: Creating Ogre Root done" << std::endl;
  }

  /**
   * @return scene manager
   */
  Ogre::SceneManager* GraphicsEngine::getSceneManager()
  {
    if(!scene_)
    {
      scene_ = root_->createSceneManager(Ogre::ST_GENERIC, "Default SceneManager");
      COUT(3) << "Info: Created SceneMan: " << scene_ << std::endl;
    }
    return scene_;
  }

  bool GraphicsEngine::load(std::string dataPath)
  {
    // temporary overwrite of dataPath, change ini file for permanent change
    if( dataPath != "" )
      dataPath_ = dataPath + "/";
    loadRessourceLocations(this->dataPath_);
    if (!root_->restoreConfig() && !root_->showConfigDialog())
      return false;
    return true;
  }

  void GraphicsEngine::initialise()
  {
    this->renderWindow_ = root_->initialise(true, "OrxonoxV2");
    Ogre::TextureManager::getSingleton().setDefaultNumMipmaps(5);
    //TODO: Do NOT load all the groups, why are we doing that? And do we really do that? initialise != load...
    Ogre::ResourceGroupManager::getSingleton().initialiseAllResourceGroups();
  }

  void GraphicsEngine::loadRessourceLocations(std::string dataPath)
  {
    //TODO: Specify layout of data file and maybe use xml-loader
    //TODO: Work with ressource groups (should be generated by a special loader)
    // Load resource paths from data file using configfile ressource type
    Ogre::ConfigFile cf;
    cf.load(dataPath + "resources.cfg");

    // Go through all sections & settings in the file
    Ogre::ConfigFile::SectionIterator seci = cf.getSectionIterator();

    std::string secName, typeName, archName;
    while (seci.hasMoreElements())
    {
      secName = seci.peekNextKey();
      Ogre::ConfigFile::SettingsMultiMap *settings = seci.getNext();
      Ogre::ConfigFile::SettingsMultiMap::iterator i;
      for (i = settings->begin(); i != settings->end(); ++i)
      {
        typeName = i->first; // for instance "FileSystem" or "Zip"
        archName = i->second; // name (and location) of archive

        Ogre::ResourceGroupManager::getSingleton().addResourceLocation(
                                           std::string(dataPath + archName),
                                           typeName, secName);
      }
    }
  }

  /**
    Returns the window handle of the render window.
    At least the InputHandler uses this to create the OIS::InputManager
    @return The window handle of the render window
  */
  size_t GraphicsEngine::getWindowHandle()
  {
    if (this->renderWindow_)
    {
      size_t windowHnd = 0;
      this->renderWindow_->getCustomAttribute("WINDOW", &windowHnd);
      return windowHnd;
    }
    else
      return 0;
  }

  /**
    Get the width of the current render window
    @return The width of the current render window
  */
  int GraphicsEngine::getWindowWidth() const
  {
    if (this->renderWindow_)
      return this->renderWindow_->getWidth();
    else
      return 0;
  }

  /**
    Get the height of the current render window
    @return The height of the current render window
  */
  int GraphicsEngine::getWindowHeight() const
  {
    if (this->renderWindow_)
      return this->renderWindow_->getHeight();
    else
      return 0;
  }

  /**
    @brief Method called by the LogListener interface from Ogre.
    We use it to capture Ogre log messages and handle it ourselves.
    @param message The message to be logged
    @param lml The message level the log is using
    @param maskDebug If we are printing to the console or not
    @param logName the name of this log (so you can have several listeners
                   for different logs, and identify them)
  */
  void GraphicsEngine::messageLogged(const std::string& message,
    Ogre::LogMessageLevel lml, bool maskDebug, const std::string &logName)
  {
    int orxonoxLevel;
    switch (lml)
    {
      case Ogre::LML_TRIVIAL:
        orxonoxLevel = this->ogreLogLevelTrivial_;
        break;
      case Ogre::LML_NORMAL:
        orxonoxLevel = this->ogreLogLevelNormal_;
        break;
      case Ogre::LML_CRITICAL:
        orxonoxLevel = this->ogreLogLevelCritical_;
        break;
      default:
        orxonoxLevel = 0;
    }
    OutputHandler::getOutStream().setOutputLevel(orxonoxLevel)
        << "*** Ogre: " << message << std::endl;
  }
}