hemisphereuvmodifier.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 _graphicsproceduralhemisphereuvmodifier_cpp
#define _graphicsproceduralhemisphereuvmodifier_cpp

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

#include "MathTools/mathtools.h"

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            HemisphereUVModifier::HemisphereUVModifier()
                {  }

            HemisphereUVModifier::~HemisphereUVModifier()
                {  }

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

            void HemisphereUVModifier::Modify(TriangleBuffer& Buffer)
            {
                for( VertexIterator VertIt = Buffer.GetVertices().begin() ; VertIt != Buffer.GetVertices().end() ; ++VertIt )
                {
                    Vector3 NormalizedPos = VertIt->Position.GetNormal();
                    Vector3 RotationVector;
                    Real Angle = 0;
                    if( NormalizedPos.Y > 0.0 ) {
                        Vector3::Unit_Y().GetRotationToAxis(NormalizedPos).ConvertToAngleAxis(Angle,RotationVector);
                    }else{
                        Vector3::Neg_Unit_Y().GetRotationToAxis(NormalizedPos).ConvertToAngleAxis(Angle,RotationVector);
                    }

                    Vector2 Vec2D(NormalizedPos.X,NormalizedPos.Z);
                    Vec2D.Normalize();
                    Vector2 UV = Vector2(0.5,0.5) + ( Vec2D * ( ( Angle / MathTools::GetHalfPi() ) * Real(0.5) ) );

                    if( NormalizedPos.Y > 0.0 ) {
                        VertIt->UV.SetValues( this->OuterHemisphereQuad.Left + UV.X * this->OuterHemisphereQuad.GetWidth(),
                                              this->OuterHemisphereQuad.Top + UV.Y * this->OuterHemisphereQuad.GetHeight() );
                    }else{
                        VertIt->UV.SetValues( this->InnerHemisphereQuad.Left + UV.X * this->InnerHemisphereQuad.GetWidth(),
                                              this->InnerHemisphereQuad.Top + UV.Y * this->InnerHemisphereQuad.GetHeight() );
                    }
                }
            }

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

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

            HemisphereUVModifier& HemisphereUVModifier::SetOuterHemisphereQuad(const RealRect& Outer)
            {
                this->OuterHemisphereQuad = Outer;
                return *this;
            }

            HemisphereUVModifier& HemisphereUVModifier::SetInnerHemisphereQuad(const RealRect& Inner)
            {
                this->InnerHemisphereQuad = Inner;
                return *this;
            }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif