F:/My Projects/LSEngine/Modules/LSMathLib/Src/Frustum/LSMFrustum.h

#ifndef __LSM_FRUSTUM_H__
#define __LSM_FRUSTUM_H__

#include "../LSMMathLib.h"
#include "../Matrix/LSMMatrix4x4.h"
#include "../Plane/LSMPlane3.h"

namespace lsm {

        // == Enumerations.
        enum LSM_FRUSTUM_PLANES {
                LSM_FP_LEFT,
                LSM_FP_RIGHT,
                LSM_FP_TOP,
                LSM_FP_BOTTOM,
                LSM_FP_NEAR,
                LSM_FP_FAR,
                LSM_FP_TOTAL
        };

        enum LSM_FRUSTUM_POINTS {
                LSM_FP_FAR_BOTTOM_LEFT,
                LSM_FP_FAR_TOP_LEFT,
                LSM_FP_FAR_TOP_RIGHT,
                LSM_FP_FAR_BOTTOM_RIGHT,
                LSM_FP_NEAR_BOTTOM_LEFT,
                LSM_FP_NEAR_TOP_LEFT,
                LSM_FP_NEAR_TOP_RIGHT,
                LSM_FP_NEAR_BOTTOM_RIGHT,
        };


        class CFrustum {
                // All is public.  This class has no secrets.
        public :
                // == Operators.
                const CPlane3 & LSE_FCALL       operator [] ( LSUINT32 _ui32Index ) const;


                // == Functions.
                LSVOID LSE_FCALL                        ExtractFromMatrix(
                        const CMatrix4x4 &_mMatrix,
                        LSBOOL _bNormalizePlanes = false );

                LSE_INLINE LSBOOL LSE_FCALL     TestPoint( const CVector3 &_vPoint ) const;

                static LSVOID LSE_CALL          GetCornersOfPlanes( LSM_FRUSTUM_PLANES _fpPlane0, LSM_FRUSTUM_PLANES _fpPlane1,
                        LSM_FRUSTUM_POINTS _fpRet[2] );

                static LSVOID LSE_CALL          GetNeighbors( LSM_FRUSTUM_PLANES _fpPlane, LSM_FRUSTUM_PLANES _fpRet[4] );


                // == Members.
#pragma pack( push, 1 )

                CPlane3                                         m_pLeftPlane;

                CPlane3                                         m_pRightPlane;

                CPlane3                                         m_pTopPlane;

                CPlane3                                         m_pBottomPlane;

                CPlane3                                         m_pNearPlane;

                CPlane3                                         m_pFarPlane;
#pragma pack( pop )


        protected :
                // == Operators.
                CPlane3 & LSE_FCALL                     operator [] ( LSUINT32 _ui32Index );
        };


        // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
        // DEFINITIONS
        // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
        // == Operators.
        LSE_INLINE const CPlane3 & LSE_FCALL CFrustum::operator [] ( LSUINT32 _ui32Index ) const {
                return reinterpret_cast<const CPlane3 *>(this)[_ui32Index];
        }

        // == Functions.
        LSE_INLINE LSBOOL LSE_FCALL CFrustum::TestPoint( const CVector3 &_vPoint ) const {
                if ( (m_pLeftPlane.SignedDistance( _vPoint ) < LSM_ZERO)
                        || (m_pRightPlane.SignedDistance( _vPoint ) < LSM_ZERO)
                        || (m_pTopPlane.SignedDistance( _vPoint ) < LSM_ZERO)
                        || (m_pBottomPlane.SignedDistance( _vPoint ) < LSM_ZERO)
                        || (m_pNearPlane.SignedDistance( _vPoint ) < LSM_ZERO)
                        || (m_pFarPlane.SignedDistance( _vPoint ) < LSM_ZERO) ) {
                        return false;
                }
                return true;
        }

        // == Operators.
        LSE_INLINE CPlane3 & LSE_FCALL CFrustum::operator [] ( LSUINT32 _ui32Index ) {
                return reinterpret_cast<CPlane3 *>(this)[_ui32Index];
        }

}       // namespace lsm

#endif  // __LSM_FRUSTUM_H__