normalsmodifier.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
 in the Software without restriction, including without limitation the rights
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 */
#ifndef _graphicsproceduralnormalsmodifier_cpp
#define _graphicsproceduralnormalsmodifier_cpp

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

#include "MathTools/mathtools.h"

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            NormalsModifier::NormalsModifier() :
                Amplify(64)
                {  }

            NormalsModifier::~NormalsModifier()
                {  }

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

            void NormalsModifier::Modify(TextureBuffer& Buffer)
            {
                Whole Width = static_cast<Whole>( Buffer.GetWidth() );
                Whole Height = static_cast<Whole>( Buffer.GetHeight() );
                Real fAmp = static_cast<Real>( this->Amplify ) * 4.0f / 255.0f;
                TextureBuffer TempBuffer( Buffer );

                for( Whole Y = 0 ; Y < Height ; ++Y )
                {
                    for( Whole X = 0 ; X < Width ; ++X )
                    {
                        Whole XPrev = (X < 1) ? 0 : (X - 1) % Width;
                        Whole XNext = (X + 1) % Width;
                        Whole YPrev = (Y < 1) ? 0 : (Y - 1) % Height;
                        Whole YNext = (Y + 1) % Height;

                        //Y Sobel filter
                        Real fPix = static_cast<Real>( Buffer.GetRedByte(XPrev,YNext) );
                        Real dY  = fPix * -1.0f;
                        fPix = static_cast<Real>( Buffer.GetRedByte(X,YNext) );
                        dY += fPix * -2.0f;
                        fPix = static_cast<Real>( Buffer.GetRedByte(XNext,YNext) );
                        dY += fPix * -1.0f;
                        fPix = static_cast<Real>( Buffer.GetRedByte(XPrev,YPrev) );
                        dY += fPix * 1.0f;
                        fPix = static_cast<Real>( Buffer.GetRedByte(X,YPrev) );
                        dY += fPix * 2.0f;
                        fPix = static_cast<Real>( Buffer.GetRedByte(XNext,YPrev) );
                        dY += fPix * 1.0f;

                        //X Sobel filter
                        fPix = static_cast<Real>( Buffer.GetRedByte(XPrev,YPrev) );
                        Real dX  = fPix * -1.0f;
                        fPix = static_cast<Real>( Buffer.GetRedByte(XPrev,Y) );
                        dX += fPix * -2.0f;
                        fPix = static_cast<Real>( Buffer.GetRedByte(XPrev,YNext) );
                        dX += fPix * -1.0f;
                        fPix = static_cast<Real>( Buffer.GetRedByte(XNext,YPrev) );
                        dX += fPix * 1.0f;
                        fPix = static_cast<Real>( Buffer.GetRedByte(XNext,Y) );
                        dX += fPix * 2.0f;
                        fPix = static_cast<Real>( Buffer.GetRedByte(XNext,YNext) );
                        dX += fPix * 1.0f;

                        Real NormX = -dX * fAmp / 255.0f;
                        Real NormY = -dY * fAmp / 255.0f;
                        Real Norm = MathTools::Sqrt(NormX * NormX + NormY * NormY + 1.0f);
                        if( Norm > (Real)10e-6 ) {
                            Norm = 1.0f / Norm;
                        }else{
                            Norm = 0.0f;
                        }
                        NormX = (NormX * Norm) * 127.0f + 128.0f;
                        NormY = (NormY * Norm) * 127.0f + 128.0f;
                        Real NormZ = Norm * 127.0f + 128.0f;

                        TempBuffer.SetPixelByte( X, Y,
                                             static_cast<UInt8>( NormX ),
                                             static_cast<UInt8>( NormY ),
                                             static_cast<UInt8>( NormZ ),
                                             Buffer.GetAlphaByte(X,Y) );
                    }
                }

                Buffer.SetData(TempBuffer);
            }

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

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

            NormalsModifier& NormalsModifier::SetAmplify(const UInt8 Amp)
                { this->Amplify = Amp;  return *this; }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif