// Swing Engine Version 1 Source Code 
// Most of techniques in the engine are mainly based on David Eberly's
// Wild Magic 4 open-source code.The author of Swing Engine learned a lot
// from Eberly's experience of architecture and algorithm.
// Several sub-systems are totally new,and others are re-implimented or
// re-organized based on Wild Magic 4's sub-systems.
// Copyright (c) 2007-2010.  All Rights Reserved
//
// Eberly's permission:
// Geometric Tools, Inc.
// http://www.geometrictools.com
// Copyright (c) 1998-2006.  All Rights Reserved
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2.1 of the License, or (at
// your option) any later version.  The license is available for reading at
// the location:
// http://www.gnu.org/copyleft/lgpl.html

#ifndef Swing_CullState_H
#define Swing_CullState_H

#include "SEFoundationLIB.h"
#include "SEPlatforms.h"
#include "SEGlobalState.h"

namespace Swing
{

//----------------------------------------------------------------------------
// Description:
// Author:Sun Che
// Date:20080701
//----------------------------------------------------------------------------
class SE_FOUNDATION_API SECullState : public SEGlobalState
{
    SE_DECLARE_RTTI;
    SE_DECLARE_NAME_ID;
    SE_DECLARE_STREAM;
    SE_DECLARE_INITIALIZE;
    SE_DECLARE_TERMINATE;

public:
    virtual StateType GetStateType(void) const { return CULL; }

    SECullState(void);
    virtual ~SECullState(void);

    enum FrontMode
    {
        FT_CCW,  // 逆时针索引顺序为正面
        FT_CW,   // 顺时针索引顺序为正面
        FT_COUNT
    };

    enum CullMode
    {
        CT_FRONT,  // 剔除正面朝向的三角形
        CT_BACK,   // 剔除被面朝向的三角形
        CT_COUNT
    };

    bool Enabled;         // default: true
    FrontMode FrontFace;  // default: FT_CW
    CullMode CullFace;    // default: CT_BACK

private:
    static const char* ms_pFrontMode[FT_COUNT];
    static const char* ms_pCullMode[CT_COUNT];
};

typedef SESmartPointer<SECullState> SECullStatePtr;

}

#endif
