weighedlerpmodifier.h

// © Copyright 2010 - 2016 BlackTopp Studios Inc.
/* This file is part of The Mezzanine Engine.

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*/
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/*
 -----------------------------------------------------------------------------
 This source file is part of ogre-procedural

 For the latest info, see http://code.google.com/p/ogre-procedural/

 Copyright (c) 2010-2013 Michael Broutin

 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
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 THE SOFTWARE.
 -----------------------------------------------------------------------------
 */
#ifndef _graphicsproceduralweighedlerpmodifier_h
#define _graphicsproceduralweighedlerpmodifier_h

#include "Graphics/Procedural/Texture/texturemodifier.h"

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            ///////////////////////////////////////////////////////////////////////////////
            /// @brief A modifier that will use the colours of the texture to be modified to perform a linear interpolation between two other textures.
            /// @details This modifier will perform a Lerp operation between the two specified textures.  This differs from the LerpGenerator in that the
            /// texture to be modified is used to determine the amount of interpolation there is to be performed.  This operation is done on each colour
            /// channel of each pixel.  The result of the Lerp is then written back to the texture.
            ///////////////////////////////////////
            class MEZZ_LIB WeighedLerpModifier : public TextureModifier
            {
            protected:
                /// @internal
                /// @brief The first texture to interpolate.
                TextureBuffer* FirstTexture;
                /// @internal
                /// @brief The second texture to interpolate.
                TextureBuffer* SecondTexture;
            public:
                /// @brief Blank constructor.
                WeighedLerpModifier();
                /// @brief Class destructor.
                virtual ~WeighedLerpModifier();

                ///////////////////////////////////////////////////////////////////////////////
                // Utility

                /// @copydoc TextureModifier::Modify(TextureBuffer&)
                /// @remarks This image provides the weights that determine how much interpolation between the two parameters image there is to
                /// perfrom, and then writes the result to this buffer.
                virtual void Modify(TextureBuffer& Buffer);
                /// @copydoc TextureModifier::GetName() const
                virtual String GetName() const;

                ///////////////////////////////////////////////////////////////////////////////
                // Configuration

                /// @brief The first texture to interpolate.
                /// @exception If the texture provided here isn't at least the same size as the texture to be modified a PARAMETERS_EXCEPTION will be thrown.
                /// @param First A pointer to the first texture to interpolate between.  Initial Value: NULL.
                /// @return Returns a reference to this.
                WeighedLerpModifier& SetFirstTexture(TextureBuffer* First);
                /// @brief The second texture to interpolate.
                /// @exception If the texture provided here isn't at least the same size as the texture to be modified a PARAMETERS_EXCEPTION will be thrown.
                /// @param Second A pointer to the second texture to interpolate between.  Initial Value: NULL.
                /// @return Returns a reference to this.
                WeighedLerpModifier& SetSecondTexture(TextureBuffer* Second);
            };//WeighedLerpModifier
        }//Procedural
    }//Graphics
}//Mezzanine

#endif