vertexnormalsmodifier.h

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

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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
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 */
#ifndef _graphicsproceduralvertexnormalsmodifier_h
#define _graphicsproceduralvertexnormalsmodifier_h

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

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            ///////////////////////////////////////////////////////////////////////////////
            /// @brief
            /// @details
            ///////////////////////////////////////
            class MEZZ_LIB VertexNormalsModifier : public MeshModifier
            {
            public:
                /// @brief An enum used to determine how normals are calculated.
                enum ComputeMode
                {
                    CM_Vertex   = 1,  ///< The normal for each vertex is the average of the normals for each triangle it belongs to.
                    CM_Triangle = 2   ///< The normal for each vertex is the same as the normal for the last triangle it belongs to.  Not ideal for vertices that are reused.
                };
            protected:
                /// @internal
                /// @brief The mode in which normals are calculated for each vertex.
                ComputeMode Compute;
            public:
                /// @brief Blank constructor.
                VertexNormalsModifier();
                /// @brief Class destructor.
                virtual ~VertexNormalsModifier();

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

                /// @copydoc MeshModifier::Modify(TriangleBuffer&)
                virtual void Modify(TriangleBuffer& Buffer);
                /// @copydoc MeshModifier::GetName() const
                virtual String GetName() const;

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

                /// @brief Sets how the normals for each vertex is to be calculated.
                /// @param Mode The mode in which normals are calculated for each vertex.
                /// @return Returns a reference to this.
                VertexNormalsModifier& SetComputerMode(const VertexNormalsModifier::ComputeMode Mode);
            };//VertexNormalsModifier
        }//Procedural
    }//Graphics
}//Mezzanine

#endif