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

Copyright © 2000-2002 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 __GLTEXTURE_H__
#define __GLTEXTURE_H__

#include "OgreGLPrerequisites.h"
#include "OgrePlatform.h"
#include "OgreRenderTexture.h"
#include "OgreTexture.h"
#include "OgreGLSupport.h"

namespace Ogre {

    class GLTexture : public Texture
    {
    public:
        // Constructor, called from SDLTextureManager
        GLTexture( const String& name, GLSupport& support, 
                   TextureType texType = TEX_TYPE_2D );
        GLTexture( const String& name, GLSupport& support, TextureType texType, 
                   uint width, uint height, uint num_mips, PixelFormat format,
                   TextureUsage usage );

        virtual ~GLTexture();        
        
        void load();
        void loadImage( const Image &img );
        void loadImages( const std::vector<Image>& images );

        void unload();

        void createRenderTexture();

        void blitToTexture( const Image& src, 
            unsigned uStartX, unsigned uStartY );

        // Takes the ogre texture type and returns the appropriate GL one
        GLenum getGLTextureType(void) const;

        // Takes the ogre texture format and returns the appropriate GL one
        GLenum getGLTextureFormat(void) const;

        GLuint getGLID() const
        { return mTextureID; }

    protected:
        void generateMipMaps( const uchar *data, bool useSoftware, bool isCompressed,
            size_t faceNumber );
        uchar* rescaleNPower2( const Image& src );
    private:
        GLuint mTextureID;
        GLSupport& mGLSupport;
    };

    class GLRenderTexture : public RenderTexture
    {
    public:
        GLRenderTexture(const String& name, uint width, uint height) 
            : RenderTexture(name, width, height) 
        {
        }

        void _copyToTexture(void);

        bool requiresTextureFlipping() const { return true; }
        virtual void writeContentsToFile( const String & filename ) {}
    };
}

#endif // __GLTEXTURE_H__
