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

Copyright (c) 2000-2013 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 __Ogre_Volume_TextureSource_H__
#define __Ogre_Volume_TextureSource_H__


#include "OgreVolumeGridSource.h"

namespace Ogre {
namespace Volume {

    /** A volume source from a 3D texture.
    */
    class _OgreVolumeExport TextureSource : public GridSource
    {
    protected:
        
        /// To have a little bit faster data access.
        unsigned long mWidthTimesHeight;

        /// The raw volume data.
        float *mData;
        
        /** Overridden from GridSource.
        */
        virtual float getVolumeGridValue(size_t x, size_t y, size_t z) const;

        /** Overridden from GridSource.
        */
        virtual void setVolumeGridValue(int x, int y, int z, float value);

    public:

        /** Constructur.
        @param volumeTextureName
            Which volume texture to get the data from.
        @param worldWidth
            The world width.
        @param worldHeight
            The world height.
        @param worldDepth
            The world depth.
        @param trilinearValue
            Whether to use trilinear filtering (true) or nearest neighbour (false) for the value.
        @param trilinearGradient
            Whether to use trilinear filtering (true) or nearest neighbour (false) for the gradient.
        @param sobelGradient
            Whether to add a bit of blur to the gradient like in a sobel filter.
        */
        explicit TextureSource(const String &volumeTextureName, const Real worldWidth, const Real worldHeight, const Real worldDepth, const bool trilinearValue = true, const bool trilinearGradient = false, const bool sobelGradient = false);
        
        /** Destructor.
        */
        ~TextureSource(void);

    };

}
}

#endif