vortexmodifier.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
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 */
#ifndef _graphicsproceduralvortexmodifier_cpp
#define _graphicsproceduralvortexmodifier_cpp

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

#include "MathTools/mathtools.h"

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            VortexModifier::VortexModifier() :
                TwistAngle(0.0)
                {  }

            VortexModifier::~VortexModifier()
                {  }

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

            void VortexModifier::Modify(TextureBuffer& Buffer)
            {
                Integer TargetWidth = Buffer.GetWidth();
                Integer TargetHeight = Buffer.GetHeight();
                Integer dwCenterX   = static_cast<Integer>( this->VortexCenter.X * static_cast<Real>(TargetWidth) );
                Integer dwCenterY   = static_cast<Integer>( this->VortexCenter.Y * static_cast<Real>(TargetHeight) );
                Integer dwRadiusX   = static_cast<Integer>( this->VortexRadius.X * static_cast<Real>(TargetWidth) );
                Integer dwRadiusY   = static_cast<Integer>( this->VortexRadius.Y * static_cast<Real>(TargetHeight) );
                Real f1_RadiusX = 1.0 / static_cast<Real>(dwRadiusX);
                Real f1_RadiusY = 1.0 / static_cast<Real>(dwRadiusY);
                TextureBuffer TempBuffer( Buffer );

                for( Integer Y = 0 ; Y < TargetHeight ; ++Y )
                {
                    Real dY = static_cast<Real>( Y - dwCenterY ) * f1_RadiusY;

                    for( Integer X = 0 ; X < TargetWidth ; ++X )
                    {
                        Real dX = static_cast<Real>( X - dwCenterX ) * f1_RadiusX;
                        Real d = MathTools::Sqrt( dX * dX + dY * dY );

                        if( d > 1.0 ) {
                            TempBuffer.SetPixel( X, Y, Buffer.GetPixel(X,Y) );
                        }else{
                            d = MathTools::Cos( d * MathTools::GetHalfPi() - MathTools::GetHalfPi() );
                            d = 1.0 - d;
                            Real nX = static_cast<Real>( X - dwCenterX );
                            Real nY = static_cast<Real>( Y - dwCenterY );
                            Real rad = this->TwistAngle * d;

                            Real bX = nX;
                            nX = bX * MathTools::Cos(rad) - nY * MathTools::Sin(rad) + dwCenterX;
                            nY = bX * MathTools::Sin(rad) + nY * MathTools::Cos(rad) + dwCenterY;

                            if( nX >= TargetWidth ) nX = nX - TargetWidth;
                            if( nY >= TargetHeight ) nY = nY - TargetHeight;
                            if( nX < 0 ) nX = TargetWidth + nX;
                            if( nY < 0 ) nY = TargetHeight + nY;

                            Integer iX = static_cast<Integer>(nX);
                            Integer iY = static_cast<Integer>(nY);

                            Real fracX = nX - iX;
                            Real fracY = nY - iY;

                            Real ul = ( 1.0 - fracX ) * ( 1.0 - fracY );
                            Real ll = ( 1.0 - fracX ) * fracY;
                            Real ur = fracX * ( 1.0 - fracY );
                            Real lr = fracX * fracY;

                            Integer WrapX = ( iX + 1 ) % TargetWidth;
                            Integer WrapY = ( iY + 1 ) % TargetHeight;
                            ColourValue PixelUL = Buffer.GetPixel( iX, iY );
                            ColourValue PixelUR = Buffer.GetPixel( WrapX, iY );
                            ColourValue PixelLL = Buffer.GetPixel( iX, WrapY );
                            ColourValue PixelLR = Buffer.GetPixel( WrapX, WrapY );

                            TempBuffer.SetPixelByte( X, Y,
                                                 ( ul * PixelUL.RedChannel * 255.0 + ll * PixelLL.RedChannel * 255.0 + ur * PixelUR.RedChannel * 255.0 + lr * PixelLR.RedChannel * 255.0 ),
                                                 ( ul * PixelUL.GreenChannel * 255.0 + ll * PixelLL.GreenChannel * 255.0 + ur * PixelUR.GreenChannel * 255.0 + lr * PixelLR.GreenChannel * 255.0 ),
                                                 ( ul * PixelUL.BlueChannel * 255.0 + ll * PixelLL.BlueChannel * 255.0 + ur * PixelUR.BlueChannel * 255.0 + lr * PixelLR.BlueChannel * 255.0 ),
                                                 ( ul * PixelUL.AlphaChannel * 255.0 + ll * PixelLL.AlphaChannel * 255.0 + ur * PixelUR.AlphaChannel * 255.0 + lr * PixelLR.AlphaChannel * 255.0 ) );
                        }
                    }
                }

                Buffer.SetData(TempBuffer);
            }

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

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

            VortexModifier& VortexModifier::SetVortexCenter(const Vector2& Center)
                { this->VortexCenter = Center;  return *this; }

            VortexModifier& VortexModifier::SetVortexCenter(const Real X, const Real Y)
                { this->VortexCenter.X = X;  this->VortexCenter.Y = Y;  return *this; }

            VortexModifier& VortexModifier::SetVortexCenterX(const Real X)
                { this->VortexCenter.X = X;  return *this; }

            VortexModifier& VortexModifier::SetVortexCenterY(const Real Y)
                { this->VortexCenter.Y = Y;  return *this; }

            VortexModifier& VortexModifier::SetVortexRadius(const Vector2& Radius)
                { this->VortexRadius = Radius;  return *this; }

            VortexModifier& VortexModifier::SetVortexRadius(const Real X, const Real Y)
                { this->VortexRadius.X = X;  this->VortexRadius.Y = Y;  return *this; }

            VortexModifier& VortexModifier::SetVortexRadiusX(const Real X)
                { this->VortexRadius.X = X;  return *this; }

            VortexModifier& VortexModifier::SetVortexRadiusY(const Real Y)
                { this->VortexRadius.Y = Y;  return *this; }

            VortexModifier& VortexModifier::SetVortexTwist(const Real Twist)
                { this->TwistAngle = Twist;  return *this; }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif