source: GTP/trunk/App/Demos/Geom/OgreStuff/include/OgreRenderTexture.h @ 1812

/*
-----------------------------------------------------------------------------
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.
-----------------------------------------------------------------------------
*/
#ifndef __RenderTexture_H__
#define __RenderTexture_H__

#include "OgrePrerequisites.h"

#include "OgreRenderTarget.h"

namespace Ogre
{    
    /** This class represents a RenderTarget that renders to a Texture. There is no 1 on 1
        relation between Textures and RenderTextures, as there can be multiple 
        RenderTargets rendering to different mipmaps, faces (for cubemaps) or slices (for 3D textures)
        of the same Texture.
    */
    class _OgreExport RenderTexture: public RenderTarget
    {
    public:
        RenderTexture(HardwarePixelBuffer *buffer, size_t zoffset);
        virtual ~RenderTexture();

                void writeContentsToFile( const String & filename );
        protected:
                HardwarePixelBuffer *mBuffer;
                size_t mZOffset;
    };

        /** This class represents a render target that renders to multiple RenderTextures
                at once. Surfaces can be bound and unbound at will, as long as the following constraints
                are met:
                - All bound surfaces have the same size
                - All bound surfaces have the same internal format 
                - Target 0 is bound
        */
        class _OgreExport MultiRenderTarget: public RenderTarget
        {
        public:
                MultiRenderTarget(const String &name);

                /** Bind a surface to a certain attachment point.
            @param attachment   0 .. mCapabilities->numMultiRenderTargets()-1
                        @param target           RenderTexture to bind.

                        It does not bind the surface and fails with an exception (ERR_INVALIDPARAMS) if:
                        - Not all bound surfaces have the same size
                        - Not all bound surfaces have the same internal format 
                */
                virtual void bindSurface(size_t attachment, RenderTexture *target)=0;

                /** Unbind attachment.
                */
                virtual void unbindSurface(size_t attachment)=0; 

                /** Error throwing implementation, it's not possible to write a MultiRenderTarget
                        to disk. 
                */
                virtual void writeContentsToFile( const String & filename );
        };
}

#endif