/*
 * This source file is part of KEOS (Free 3D Engine)
 * For the latest info, see http://www.keosengine.org/
 * E-mails : thierry.vouriot@keosengine.org, yeri@keosengine.org
 * 
 * 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.
 *
 */

#ifndef KEOS_RENDERAPP_H
#define KEOS_RENDERAPP_H

#include "KeosPrerequisites.h"
#include "KeosRoot.h"
#include "KeosTimer.h"

namespace Keos 
{
    //-----------------------------------------------------------------------
    /** Abstract class which contains the functions for the
     *  render of one RenderTarget.
     */
    class KEOS_EXPORT IRenderApp
    {  
        friend IRenderTarget;

    public:
      
        /** Constructor.
         */
        IRenderApp() { 
            m_pRenderTarget = NULL; 
            m_bInit = false;
        }

        /** Test if Init function has been called.
         */
        bool IsInit() { return m_bInit; } 

        /** Set if Init function has been called.
         */
        void SetInit(bool bInit) { m_bInit = bInit; }

        /** Initialization.
         *  (Called only once at the start of rendering loop)
         */
        virtual void Init(void) = 0;

        /** Render one frame.
         */
        virtual void Render(void) = 0;

        /* *Update.
         *  (Called just before Render function)
         */
        virtual void Update(void) = 0;

        /** Release resource allocated in Init function.
         */
        virtual void Release(void) = 0;

        /** Return an instance of RenderSystem.
         *  @return The RenderSystem.
         */
        static IRenderSystem* GetRenderSystem() { return CRoot::Instance().GetRenderSystem(); }

        /** Return the rendertarget.
         */
        IRenderTarget* GetRenderTarget(void) { return m_pRenderTarget; }

        /** Return the time since the start of the engine.
         */
        static unsigned long GetTime() { return CRoot::Instance().GetTimer()->GetMilliseconds(); }

    protected:
        //! Pointer on the rendertarget
        IRenderTarget* m_pRenderTarget;

        //! Is initialized ? (Init function has been called)
        bool m_bInit;
    };

} // namespace Keos

#endif // KEOS_RENDERAPP_H
