planegenerator.cpp

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

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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,
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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 -----------------------------------------------------------------------------
 */
#ifndef _graphicsproceduralplanegenerator_cpp
#define _graphicsproceduralplanegenerator_cpp

#include "Graphics/Procedural/Mesh/planegenerator.h"

#include "exception.h"

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            PlaneGenerator::PlaneGenerator() :
                PlaneNormal( Vector3::Unit_Y() ),
                PlaneSize(1,1),
                NumSegX(1),
                NumSegY(1)
                {  }

            PlaneGenerator::PlaneGenerator(const Vector3& Norm, const Vector2& Size) :
                PlaneNormal(Norm),
                PlaneSize(Size),
                NumSegX(1),
                NumSegY(1)
                {  }

            PlaneGenerator::~PlaneGenerator()
                {  }

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

            void PlaneGenerator::AddToTriangleBuffer(TriangleBuffer& Buffer) const
            {
                Buffer.RebaseOffset();
                Buffer.EstimateVertexCount( ( this->NumSegX + 1 ) * ( this->NumSegY + 1 ) );
                Buffer.EstimateIndexCount( this->NumSegX * this->NumSegY * 6 );
                Integer Offset = 0;

                Vector3 vX = this->PlaneNormal.Perpendicular();
                Vector3 vY = this->PlaneNormal.CrossProduct(vX);
                Vector3 delta1 = vX * ( this->PlaneSize.X / (Real)this->NumSegX );
                Vector3 delta2 = vY * ( this->PlaneSize.Y / (Real)this->NumSegY );
                // build one corner of the square
                Vector3 orig = ( vX * ( -0.5f * this->PlaneSize.X ) ) - ( vY * ( 0.5f * this->PlaneSize.Y ) );

                for( Whole i1 = 0 ; i1 <= this->NumSegX ; i1++ )
                {
                    for( Whole i2 = 0 ; i2 <= this->NumSegY ; i2++ )
                    {
                        this->AddPoint(Buffer, orig + ( delta1 * Real(i1) ) + ( delta2 * Real(i2) ),
                                       this->PlaneNormal,
                                       Vector2( i1 / (Real)this->NumSegX, i2 / (Real)this->NumSegY ) );
                    }
                }

                Boole Reverse = false;
                if( delta1.CrossProduct(delta2).DotProduct(this->PlaneNormal) > 0 )
                    Reverse = true;

                for( Whole n1 = 0 ; n1 < this->NumSegX ; n1++ )
                {
                    for( Whole n2 = 0 ; n2 < this->NumSegY ; n2++ )
                    {
                        if(Reverse) {
                            Buffer.AddIndex( Offset + 0 );
                            Buffer.AddIndex( Offset + ( this->NumSegY + 1 ) );
                            Buffer.AddIndex( Offset + 1 );
                            Buffer.AddIndex( Offset + 1 );
                            Buffer.AddIndex( Offset + ( this->NumSegY + 1 ) );
                            Buffer.AddIndex( Offset + ( this->NumSegY + 1 ) + 1 );
                        }else{
                            Buffer.AddIndex( Offset + 0 );
                            Buffer.AddIndex( Offset + 1 );
                            Buffer.AddIndex( Offset + ( this->NumSegY + 1 ) );
                            Buffer.AddIndex( Offset + 1 );
                            Buffer.AddIndex( Offset + ( this->NumSegY + 1 ) + 1 );
                            Buffer.AddIndex( Offset + ( this->NumSegY + 1 ) );
                        }
                        Offset++;
                    }
                    Offset++;
                }
            }

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

            PlaneGenerator& PlaneGenerator::SetNormal(const Vector3& Norm)
            {
                if( this->PlaneNormal.IsZeroLength() )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Facing direction of a plane cannot be zero length.");

                this->PlaneNormal = Norm;
                return *this;
            }

            PlaneGenerator& PlaneGenerator::SetSizeX(const Real SizeX)
            {
                if( SizeX <= 0.0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Size on an axis for a generated plane mesh must be greater than zero.");

                this->PlaneSize.X = SizeX;
                return *this;
            }

            PlaneGenerator& PlaneGenerator::SetSizeY(const Real SizeY)
            {
                if( SizeY <= 0.0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Size on an axis for a generated plane mesh must be greater than zero.");

                this->PlaneSize.Y = SizeY;
                return *this;
            }

            PlaneGenerator& PlaneGenerator::SetSize(const Vector2 Size)
            {
                this->SetSizeX(Size.X);
                this->SetSizeY(Size.Y);
                return *this;
            }

            PlaneGenerator& PlaneGenerator::SetNumSegX(const Whole SegX)
            {
                if( SegX == 0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Number of segments for generated plane mesh must be greater than zero.");

                this->NumSegX = SegX;
                return *this;
            }

            PlaneGenerator& PlaneGenerator::SetNumSegY(const Whole SegY)
            {
                if( SegY == 0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Number of segments for generated plane mesh must be greater than zero.");

                this->NumSegY = SegY;
                return *this;
            }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif