/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

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/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
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containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
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You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
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*==LICENSE==*/

#ifndef plCullPoly_inc
#define plCullPoly_inc

#include "hsTemplates.h"
#include "hsGeometry3.h"
#include "hsBitVector.h"

class hsStream;
class hsResMgr;
struct hsMatrix44;

const float          kCullPolyDegen = 1.e-4f;

class plCullPoly
{
public:
    enum {
        kNone       = 0x0,
        kHole       = 0x1,
        kTwoSided   = 0x2
    };

    uint32_t                  fFlags;
    mutable hsBitVector     fClipped; // fClipped[i] => edge(fVerts[i], fVerts[(i+1)%n])

    hsTArray<hsPoint3>      fVerts;
    hsVector3               fNorm;
    float                fDist;
    hsPoint3                fCenter;
    float                fRadius;

    const hsPoint3&         GetCenter() const { return fCenter; }
    float                GetRadius() const { return fRadius; }

    void                    SetHole(hsBool on) { if( on )fFlags |= kHole; else fFlags &= ~kHole; }
    void                    SetTwoSided(hsBool on) { if( on )fFlags |= kTwoSided; else fFlags &= ~kTwoSided; }

    hsBool                  IsHole() const { return fFlags & kHole; } // Assumes kHole is 0x1
    hsBool                  IsTwoSided() const { return 0 != (fFlags & kTwoSided); }

    plCullPoly&             Init(const plCullPoly& p) { fClipped.Clear(); fVerts.SetCount(0); fFlags = p.fFlags; fNorm = p.fNorm; fDist = p.fDist; fCenter = p.fCenter; return *this; }
    plCullPoly&             Flip(const plCullPoly& p);
    plCullPoly&             InitFromVerts(uint32_t f=kNone);
    float                ICalcRadius() const;

    plCullPoly&             Transform(const hsMatrix44& l2w, const hsMatrix44& w2l, plCullPoly& dst) const;

    void                    Read(hsStream* s, hsResMgr* mgr);
    void                    Write(hsStream* s, hsResMgr* mgr);

    hsBool                  DegenerateVert(const hsPoint3& p) const { return fVerts.GetCount() && (kCullPolyDegen > hsVector3(&p, &fVerts[fVerts.GetCount()-1]).MagnitudeSquared()); }

    hsBool                  Validate() const; // no-op, except for special debugging circumstances.
};

#endif // plCullPoly_inc
