OgreRenderTargetListener.h

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

Copyright (c) 2000-2012 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/
#ifndef __RenderTargetListener_H__
#define __RenderTargetListener_H__


#include "OgrePrerequisites.h"

namespace Ogre {

    struct RenderTargetEvent
    {
        RenderTarget* source;
    };

    struct RenderTargetViewportEvent
    {
        Viewport* source;
    };

    class _OgreExport RenderTargetListener
    {
        /*
        Note that this could have been an abstract class, but I made
        the explicit choice not to do this, because I wanted to give
        people the option of only implementing the methods they wanted,
        rather than having to create 'do nothing' implementations for
        those they weren't interested in. As such this class follows
        the 'Adapter' classes in Java rather than pure interfaces.
        */
    public:
        virtual ~RenderTargetListener() {}
        virtual void preRenderTargetUpdate(const RenderTargetEvent& evt)
        { (void)evt; }

        virtual void postRenderTargetUpdate(const RenderTargetEvent& evt)
        { (void)evt; }

        /* Called just before a Viewport on a RenderTarget is to be updated.
        @remarks
            This method is called before each viewport on the RenderTarget is
            rendered to. You can use this to perform per-viewport settings changes,
            such as showing / hiding particular overlays.
        */
        virtual void preViewportUpdate(const RenderTargetViewportEvent& evt)
        { (void)evt; }

        /* Called just after a Viewport on a RenderTarget is to be updated.
        @remarks
            This method is called after each viewport on the RenderTarget is
            rendered to. 
        */
        virtual void postViewportUpdate(const RenderTargetViewportEvent& evt)
        { (void)evt; }

        virtual void viewportAdded(const RenderTargetViewportEvent& evt)
                { (void)evt; }
        virtual void viewportRemoved(const RenderTargetViewportEvent& evt)
                { (void)evt; }
    };
}

#endif