lookupmodifier.cpp

// © Copyright 2010 - 2016 BlackTopp Studios Inc.
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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
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 */
#ifndef _graphicsprocedurallookupmodifier_cpp
#define _graphicsprocedurallookupmodifier_cpp

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

#include "MathTools/mathtools.h"

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            LookupModifier::LookupModifier() :
                LookupTexture(NULL)
                {  }

            LookupModifier::~LookupModifier()
                {  }

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

            void LookupModifier::Modify(TextureBuffer& Buffer)
            {
                if( this->LookupTexture != NULL ) {
                    Whole LookupWidth = this->LookupTexture->GetWidth();
                    Whole LookupHeight = this->LookupTexture->GetHeight();
                    Whole TargetWidth = Buffer.GetWidth();
                    Whole TargetHeight = Buffer.GetHeight();

                    if( LookupWidth != TargetWidth && LookupHeight != TargetHeight ) {
                        MEZZ_EXCEPTION(ExceptionBase::INVALID_STATE_EXCEPTION,"The LookupTexture size and the target texture size must be the same.");
                    }

                    TextureBuffer TempBuffer( Buffer );

                    for( Whole Y = 0 ; Y < LookupHeight ; ++Y )
                    {
                        for( Whole X = 0 ; X < LookupWidth ; ++X )
                        {
                            ColourValue PixelColour = this->LookupTexture->GetPixel(X,Y);
                            Whole U = static_cast<Whole>( PixelColour.RedChannel * static_cast<Real>( TargetWidth ) );
                            Whole V = static_cast<Whole>( PixelColour.GreenChannel * static_cast<Real>( TargetHeight ) );
                            U = MathTools::Clamp( U, Whole(0), TargetWidth - 1 );
                            V = MathTools::Clamp( V, Whole(0), TargetHeight - 1 );
                            TempBuffer.SetPixel( X, Y, Buffer.GetPixel(V,U) );
                        }
                    }

                    Buffer.SetData(TempBuffer);
                }
            }

            String LookupModifier::GetName() const
                { return "LookupModifier"; }

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

            LookupModifier& LookupModifier::SetLookupTexture(TextureBuffer* Lookup)
                { this->LookupTexture = Lookup;  return *this; }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif