source: OGRE/trunk/ogrenew/Samples/GTKDemo/include/ExampleGTKApplication.h @ 657

/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2005 The OGRE Team
Also see acknowledgements in Readme.html

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.
-----------------------------------------------------------------------------
*/
/*
-----------------------------------------------------------------------------
Filename:    ExampleApplication.h
Description: Base class for all the OGRE examples
-----------------------------------------------------------------------------
*/

#ifndef __ExampleApplication_H__
#define __ExampleApplication_H__

#include "Ogre.h"
#include "OgreConfigFile.h"
#include "ExampleFrameListener.h"


using namespace Ogre;

/** Base class which manages the standard startup of an Ogre application.
    Designed to be subclassed for specific examples if required.
*/
class ExampleApplication
{
public:
    /// Standard constructor
    ExampleApplication()
    {
        mFrameListener = 0;
        mRoot = 0;
    }
    /// Standard destructor
    virtual ~ExampleApplication()
    {
        if (mFrameListener)
            delete mFrameListener;
        if (mRoot)
            delete mRoot;
    }

    /// Start the example
    virtual void go(void)
    {
        if (!setup())
            return;

        mRoot->startRendering();
    }

protected:
    Root *mRoot;
    Camera* mCamera;
    SceneManager* mSceneMgr;
    FrameListener* mFrameListener;
    RenderWindow* mWindow;

    // These internal methods package up the stages in the startup process
    /** Sets up the application - returns false if the user chooses to abandon configuration. */
    virtual bool setup(void)
    {
        mRoot = new Root();

        setupResources();

        // We choose only the OpenGL rendering subsystem
        // If it does not exist, the initialise call will exit with the
        // #2 "Cannot initialise - no render system has been selected.." error
        Ogre::RenderSystemList::iterator pRend = mRoot->getAvailableRenderers()->begin();
        while (pRend != mRoot->getAvailableRenderers()->end())
        {
            if ((*pRend)->getName() == "OpenGL Rendering Subsystem")
                mRoot->setRenderSystem(*pRend);
            pRend++;
        }

        mRoot->initialise(false);
        setupGTKWindow();

        chooseSceneManager();

        createCamera();
        createViewports();

        // Set default mipmap level (NB some APIs ignore this)
        TextureManager::getSingleton().setDefaultNumMipmaps(5);

        // Create the scene
        createScene();

        createFrameListener();

        return true;

    }

    virtual void chooseSceneManager(void)
    {
        // Get the SceneManager, in this case a generic one
        mSceneMgr = mRoot->getSceneManager(ST_GENERIC);
    }
    virtual void createCamera(void)
    {
        // Create the camera
        mCamera = mSceneMgr->createCamera("PlayerCam");

        // Position it at 500 in Z direction
        mCamera->setPosition(Vector3(0,0,500));
        // Look back along -Z
        mCamera->lookAt(Vector3(0,0,-300));
        mCamera->setNearClipDistance(5);

    }
    virtual void createFrameListener(void) = 0;

    virtual void createScene(void) = 0;    // pure virtual - this has to be overridden

    virtual void createViewports(void)
    {
        // Create one viewport, entire window
        Viewport* vp = mWindow->addViewport(mCamera);
        vp->setBackgroundColour(ColourValue(0,0,0));
    }

    /// Method which will define the source of resources (other than current folder)
    virtual void setupResources(void)
    {
        // Load resource paths from config file
        ConfigFile cf;
        cf.load("resources.cfg");

        // Go through all settings in the file
        ConfigFile::SettingsIterator i = cf.getSettingsIterator();

        String typeName, archName;
        while (i.hasMoreElements())
        {
            typeName = i.peekNextKey();
            archName = i.getNext();
            ResourceManager::addCommonArchiveEx( archName, typeName );
        }
    }


        virtual void setupGTKWindow(void) = 0;
};


#endif