cellgenerator.cpp

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

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*/
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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
 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 _graphicsproceduralcellgenerator_cpp
#define _graphicsproceduralcellgenerator_cpp

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

#include "vector3.h"
#include "MathTools/mathtools.h"

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            CellGenerator::CellGenerator() :
                GenColour(1.0,1.0,1.0,1.0),
                GenSeed(5120),
                GenRegularity(128),
                GenDensity(8),
                GenMode(CellGenerator::CM_Grid),
                GenPattern(CellGenerator::CP_Both)
                {  }

            CellGenerator::~CellGenerator()
                {  }

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

            void CellGenerator::AddToTextureBuffer(TextureBuffer& Buffer) const
            {
                Boole cfc;
                Real Coeff;

                Whole TargetWidth = Buffer.GetWidth();
                Whole TargetHeight = Buffer.GetHeight();

                const Real Regularity = this->GenRegularity / 255.0;
                std::vector<Vector3> CellPoints( this->GenDensity * this->GenDensity );
                MathTools::MersenneTwisterGenerator32 NumGen(this->GenSeed);

                for( Whole Y = 0 ; Y < this->GenDensity ; ++Y )
                {
                    for( Whole X = 0 ; X < this->GenDensity ; ++X )
                    {
                        Real RandNum1 = NumGen.GeneratePositiveReal();//static_cast<Real>( NumGen.GenerateInt() ) / 65536.0;
                        Real RandNum2 = NumGen.GeneratePositiveReal();//static_cast<Real>( NumGen.GenerateInt() ) / 65536.0;
                        CellPoints[X + Y * this->GenDensity].X = ( X + 0.5 + ( RandNum1 - 0.5 ) * ( 1 - Regularity ) ) / this->GenDensity - 1.0 / TargetWidth;
                        CellPoints[X + Y * this->GenDensity].Y = ( Y + 0.5 + ( RandNum2 - 0.5 ) * ( 1 - Regularity ) ) / this->GenDensity - 1.0 / TargetHeight;
                        CellPoints[X + Y * this->GenDensity].Z = 0;
                    }
                }

                for( Whole Y = 0 ; Y < TargetHeight ; ++Y )
                {
                    for( Whole X = 0 ; X < TargetWidth ; ++X )
                    {
                        Vector3 PixelPos;
                        PixelPos.X = static_cast<Real>( X ) / static_cast<Real>( TargetWidth ),
                        PixelPos.Y = static_cast<Real>( Y ) / static_cast<Real>( TargetHeight );
                        PixelPos.Z = 0.0;

                        Real MinDist = 10.0;
                        Real NextMinDist = MinDist;
                        Integer Xo = X * this->GenDensity / TargetWidth;
                        Integer Yo = Y * this->GenDensity / TargetHeight;
                        for( Integer V = -1 ; V < 2 ; ++V )
                        {
                            Integer Vo = ( ( Yo + this->GenDensity + V ) % this->GenDensity ) * this->GenDensity;
                            for( Integer U = -1 ; U < 2 ; ++U )
                            {
                                Vector3 CellPos = CellPoints[ ( ( Xo + this->GenDensity + U ) % this->GenDensity ) + Vo ];
                                if( U == -1 && X * this->GenDensity < TargetWidth )
                                    { CellPos.X -= 1; }
                                if( V == -1 && Y * this->GenDensity < TargetHeight )
                                    { CellPos.Y -= 1; }
                                if( U == 1 && X * this->GenDensity >= TargetWidth * ( this->GenDensity - 1 ) )
                                    { CellPos.X += 1; }
                                if( V == 1 && Y * this->GenDensity >= TargetHeight * ( this->GenDensity - 1 ) )
                                    { CellPos.Y += 1; }

                                Real Norm = PixelPos.Distance(CellPos);
                                if( Norm < MinDist ) {
                                    NextMinDist = MinDist;
                                    MinDist = Norm;
                                }else if( Norm < NextMinDist ) {
                                    NextMinDist = Norm;
                                }
                            }
                        }

                        switch( this->GenPattern )
                        {
                            case CellGenerator::CP_Cross:
                            {
                                MinDist = MathTools::Clamp( 2 * NextMinDist * this->GenDensity - 1, Real(0.0), Real(1.0) );
                                break;
                            }
                            case CellGenerator::CP_Cone:
                            {
                                MinDist = MathTools::Clamp( 1 - MinDist * this->GenDensity, Real(0.0), Real(1.0) );
                                break;
                            }
                            default:
                            case CellGenerator::CP_Both:
                            {
                                MinDist = MathTools::Clamp( ( NextMinDist - MinDist ) * this->GenDensity, Real(0.0), Real(1.0) );
                                break;
                            }
                        }

                        switch( this->GenMode )
                        {
                            case CellGenerator::CM_Chessboard:
                            {
                                cfc = ( ( Xo & 1 ) ^ ( Yo & 1 ) ) != 0;
                                Coeff = ( 1 - 2 * cfc ) / 2.5;
                                Buffer.SetRedByte( X, Y, static_cast<UInt8>( ( cfc + Coeff * MinDist ) * this->GenColour.RedChannel * 255.0 ) );
                                Buffer.SetGreenByte( X, Y, static_cast<UInt8>( ( cfc + Coeff * MinDist ) * this->GenColour.GreenChannel * 255.0 ) );
                                Buffer.SetBlueByte( X, Y, static_cast<UInt8>( ( cfc + Coeff * MinDist ) * this->GenColour.BlueChannel * 255.0 ) );
                                break;
                            }
                            default:
                            case CellGenerator::CM_Grid:
                            {
                                Buffer.SetRedByte( X, Y, static_cast<UInt8>( MinDist * this->GenColour.RedChannel * 255.0 ) );
                                Buffer.SetGreenByte( X, Y, static_cast<UInt8>( MinDist * this->GenColour.GreenChannel * 255.0 ) );
                                Buffer.SetBlueByte( X, Y, static_cast<UInt8>( MinDist * this->GenColour.BlueChannel * 255.0 ) );
                                break;
                            }
                        }
                        Buffer.SetAlphaReal( X, Y, this->GenColour.AlphaChannel );
                    }
                }
            }

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

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

            CellGenerator& CellGenerator::SetColour(const ColourValue& Colour)
            {
                this->GenColour = Colour;
                return *this;
            }

            CellGenerator& CellGenerator::SetColour(const Real Red, const Real Green, const Real Blue, const Real Alpha)
            {
                this->GenColour.SetValues(Red,Green,Blue,Alpha);
                return *this;
            }

            CellGenerator& CellGenerator::SetSeed(const Whole Seed)
            {
                this->GenSeed = Seed;
                return *this;
            }

            CellGenerator& CellGenerator::SetRegularity(const UInt8 Regularity)
            {
                this->GenRegularity = Regularity;
                return *this;
            }

            CellGenerator& CellGenerator::SetDensity(const Whole Density)
            {
                this->GenDensity = Density;
                return *this;
            }

            CellGenerator& CellGenerator::SetMode(const CellMode Mode)
            {
                this->GenMode = Mode;
                return *this;
            }

            CellGenerator& CellGenerator::SetPattern(const CellPattern Pattern)
            {
                this->GenPattern = Pattern;
                return *this;
            }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif