Frustum.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

/*
 * Copyright (C) 2006-2010 - Frictional Games
 *
 * This file is part of HPL1 Engine.
 */

#ifndef HPL_FRUSTUM_H
#define HPL_FRUSTUM_H

#include "hpl1/engine/graphics/GraphicsTypes.h"
#include "hpl1/engine/math/BoundingVolume.h"
#include "hpl1/engine/math/MathTypes.h"
#include "hpl1/engine/system/SystemTypes.h"

namespace hpl {

class iLowLevelGraphics;

enum eFrustumPlane {
    eFrustumPlane_Left = 0,
    eFrustumPlane_Right = 1,
    eFrustumPlane_Bottom = 2,
    eFrustumPlane_Top = 3,
    eFrustumPlane_Near = 4,
    eFrustumPlane_Far = 5,
    eFrustumPlane_LastEnum = 7,
};

enum eFrustumCollision {
    eFrustumCollision_Inside,
    eFrustumCollision_Outside,
    eFrustumCollision_Intersect,
    eFrustumCollision_LastEnum
};

class cFrustum {
public:
    cFrustum();

    void SetViewProjMatrix(const cMatrixf &a_mtxProj, const cMatrixf &a_mtxView,
                           float afFarPlane, float afNearPlane, float afFOV, float afAspect,
                           const cVector3f &avOrigin, bool abInfFarPlane = false);

    cPlanef GetPlane(eFrustumPlane aType);

    eFrustumCollision CollideBoundingVolume(cBoundingVolume *aBV);

    eFrustumCollision CollideFustrumSphere(cBoundingVolume *aBV);

    eFrustumCollision CollideBVSphere(cBoundingVolume *aBV);
    eFrustumCollision CollideBVAABB(cBoundingVolume *aBV);

    bool CheckLineIntersection(const cVector3f &avPoint1, const cVector3f &avPoint2);

    bool CheckQuadMeshIntersection(tVector3fVec *apPoints);

    bool CheckVolumeIntersection(cShadowVolumeBV *apVolume);

    cSpheref GetBoundingSphere() { return mBoundingSphere; }
    const cBoundingVolume &GetBoundingVolume() { return mBoundingVolume; }

    const cVector3f &GetOrigin();
    cBoundingVolume *GetOriginBV();

    cVector3f GetForward();

    void Draw(iLowLevelGraphics *apLowLevelGraphics);

private:
    void UpdatePlanes();
    void UpdateSphere();
    void UpdateEndPoints();
    void UpdateBV();

    float mfFarPlane;
    float mfNearPlane;
    float mfAspect;
    float mfFOV;

    bool mbInfFarPlane;

    cVector3f mvOrigin;
    cBoundingVolume mOriginBV;

    cMatrixf m_mtxViewProj;
    cMatrixf m_mtxModelView;
    cPlanef mPlane[6];
    cSpheref mBoundingSphere;
    cBoundingVolume mBoundingVolume;

    cVector3f mvEndPoints[4];
    tVector3fVec mvPoints;
};

} // namespace hpl

#endif // HPL_FRUSTUM_H