vertexnormalsmodifier.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 _graphicsproceduralvertexnormalsmodifier_cpp
#define _graphicsproceduralvertexnormalsmodifier_cpp

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

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            VertexNormalsModifier::VertexNormalsModifier() :
                Compute(VertexNormalsModifier::CM_Vertex)
                {  }

            VertexNormalsModifier::~VertexNormalsModifier()
                {  }

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

            void VertexNormalsModifier::Modify(TriangleBuffer& Buffer)
            {
                const IndexContainer& Indices = Buffer.GetIndices();
                VertexContainer& Vertices = Buffer.GetVertices();

                if( this->Compute == VertexNormalsModifier::CM_Triangle ) {
                    for( Whole Index = 0 ; Index < Indices.size() ; Index += 3 )
                    {
                        Vector3 v1 = Vertices[Indices[Index]].Position;
                        Vector3 v2 = Vertices[Indices[Index+1]].Position;
                        Vector3 v3 = Vertices[Indices[Index+2]].Position;
                        Vector3 VertNormal = (v2-v1).CrossProduct(v3-v1).GetNormal();
                        Vertices[Indices[Index]].Normal = VertNormal;
                        Vertices[Indices[Index+1]].Normal = VertNormal;
                        Vertices[Indices[Index+2]].Normal = VertNormal;
                    }
                }else if( this->Compute == VertexNormalsModifier::CM_Vertex ) {
                    std::vector< std::vector<Vector3> > TempNormals;
                    TempNormals.resize(Vertices.size());
                    for( Whole Index = 0 ; Index < Indices.size() ; Index += 3 )
                    {
                        Vector3 v1 = Vertices[Indices[Index]].Position;
                        Vector3 v2 = Vertices[Indices[Index+1]].Position;
                        Vector3 v3 = Vertices[Indices[Index+2]].Position;
                        Vector3 VertNormal = (v2-v1).CrossProduct(v3-v1);
                        TempNormals[Indices[Index]].push_back(VertNormal);
                        TempNormals[Indices[Index+1]].push_back(VertNormal);
                        TempNormals[Indices[Index+2]].push_back(VertNormal);
                    }
                    for( Whole CurrVertex = 0 ; CurrVertex < Vertices.size() ; ++CurrVertex )
                    {
                        Vector3 VertNormal(0.0,0.0,0.0);
                        for( Whole CurrNormal = 0 ; CurrNormal < TempNormals[CurrVertex].size() ; ++CurrNormal )
                        {
                            VertNormal += TempNormals[CurrVertex][CurrNormal];
                        }
                        Vertices[CurrVertex].Normal = VertNormal.GetNormal();
                    }
                }
            }

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

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

            VertexNormalsModifier& VertexNormalsModifier::SetComputerMode(const VertexNormalsModifier::ComputeMode Mode)
            {
                this->Compute = Mode;
                return *this;
            }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif