boxuvmodifier.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 _graphicsproceduralboxuvmodifier_cpp
#define _graphicsproceduralboxuvmodifier_cpp

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

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            BoxUVModifier::BoxUVModifier() :
                BoxHalfExtents(1.0,1.0,1.0),
                BoxPosition(0.0,0.0,0.0),
                Mapping(BoxUVModifier::MT_Full)
                {  }

            BoxUVModifier::~BoxUVModifier()
                {  }

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

            void BoxUVModifier::Modify(TriangleBuffer& Buffer)
            {
                static const Vector3 Directions[6] = { Vector3::Unit_X(), Vector3::Unit_Y(), Vector3::Unit_Z(), Vector3::Neg_Unit_X(), Vector3::Neg_Unit_Y(), Vector3::Neg_Unit_Z()  };

                for( VertexIterator VertIt = Buffer.GetVertices().begin() ; VertIt != Buffer.GetVertices().end() ; ++VertIt )
                {
                    Vector3 VertPos = VertIt->Position - this->BoxPosition;
                    if( !VertPos.IsZeroLength() ) {
                        //VertPos.Normalize();
                        VertPos.X /= ( this->BoxHalfExtents.X * 2.0 );
                        VertPos.Y /= ( this->BoxHalfExtents.Y * 2.0 );
                        VertPos.Z /= ( this->BoxHalfExtents.Z * 2.0 );
                        Vector3 VertNorm = VertIt->Normal;
                        Real MaxAxis = 0;
                        Integer PrincipalAxis = 0;
                        for( UInt8 AxisIndex = 0 ; AxisIndex < 6 ; ++AxisIndex )
                        {
                            if( Directions[AxisIndex].DotProduct(VertNorm) > MaxAxis ) {
                                MaxAxis = Directions[AxisIndex].DotProduct(VertNorm);
                                PrincipalAxis = AxisIndex;
                            }
                        }

                        Vector3 vX, vY;
                        if( PrincipalAxis % 3 == 1 ) {
                            vY = Vector3::Unit_X();
                        }else{
                            vY = Vector3::Unit_Y();
                        }
                        vX = Directions[PrincipalAxis].CrossProduct(vY);

                        Vector2 UVCoord( 0.5 - vX.DotProduct(VertPos), 0.5 - vY.DotProduct(VertPos) );
                        if( this->Mapping == BoxUVModifier::MT_Full ) {
                            VertIt->UV = UVCoord;
                        }else if( this->Mapping == BoxUVModifier::MT_Cross ) {
                            // Too lazy to think of a more elegant solution
                            switch( PrincipalAxis )
                            {
                                case 1:  VertIt->UV = Vector2( ( UVCoord.X + 2 ) / 4, ( UVCoord.Y + 1 ) / 3 );  break;  // 3,2
                                case 2:  VertIt->UV = Vector2( ( UVCoord.X + 1 ) / 4, UVCoord.Y / 3 );          break;  // 2,1
                                case 3:  VertIt->UV = Vector2( ( UVCoord.X + 3 ) / 4, ( UVCoord.Y + 1 ) / 3 );  break;  // 4,2
                                case 4:  VertIt->UV = Vector2( UVCoord.X / 4, ( UVCoord.Y + 1 ) / 3 );          break;  // 1,2
                                case 5:  VertIt->UV = Vector2( ( UVCoord.X + 1 ) / 4, ( UVCoord.Y + 2 ) / 3 );  break;  // 2,3
                                case 6:  VertIt->UV = Vector2( ( UVCoord.X + 1 ) / 4, ( UVCoord.Y + 1 ) / 3 );  break;  // 2,2
                            }
                        }else if( this->Mapping == BoxUVModifier::MT_Packed ) {
                            VertIt->UV = Vector2( ( UVCoord.X + PrincipalAxis % 3 ) / 3, ( UVCoord.Y + PrincipalAxis / 3 ) / 2 );
                        }
                    }
                }
            }

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

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

            BoxUVModifier& BoxUVModifier::SetMappingType(const MappingType Type)
            {
                this->Mapping = Type;
                return *this;
            }

            BoxUVModifier& BoxUVModifier::SetBoxPosition(const Vector3& Position)
            {
                this->BoxPosition = Position;
                return *this;
            }

            BoxUVModifier& BoxUVModifier::SetBoxPosition(const Real X, const Real Y, const Real Z)
            {
                this->BoxPosition.SetValues(X,Y,Z);
                return *this;
            }

            BoxUVModifier& BoxUVModifier::SetBoxHalfSize(const Vector3& HalfSize)
            {
                this->BoxHalfExtents = HalfSize;
                return *this;
            }

            BoxUVModifier& BoxUVModifier::SetBoxHalfSize(const Real X, const Real Y, const Real Z)
            {
                this->BoxHalfExtents.SetValues(X,Y,Z);
                return *this;
            }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif