/*==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/>.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/

#ifndef plAccMeshSmooth_inc
#define plAccMeshSmooth_inc

#include "hsTemplates.h"
#include "plAccessGeometry.h"
#include "plAccessSpan.h"

struct hsPoint3;
struct hsVector3;
class plGeometrySpan;

class plAccMeshSmooth
{
public:
    enum {
        kNone               = 0x0,
        kSmoothNorm         = 0x1,
        kSmoothPos          = 0x2,
        kSmoothDiffuse      = 0x4
    };

protected:
    struct VtxAccum
    {
        hsPoint3        fPos;
        hsVector3       fNorm;
        hsColorRGBA     fDiffuse;
    };

    UInt32          fFlags;

    hsScalar        fMinNormDot;
    hsScalar        fDistTolSq;

    plAccessGeometry            fAccGeom;
    hsTArray<plAccessSpan>      fSpans;

    hsPoint3        IPositionToWorld(plAccessSpan& span, int i) const;
    hsVector3       INormalToWorld(plAccessSpan& span, int i) const;
    hsPoint3        IPositionToLocal(plAccessSpan& span, const hsPoint3& wPos) const;
    hsVector3       INormalToLocal(plAccessSpan& span, const hsVector3& wNorm) const;

    void            FindEdges(UInt32 maxVtxIdx, UInt32 nTris, UInt16* idxList, hsTArray<UInt16>& edgeVerts);
    void            FindEdges(hsTArray<plGeometrySpan*>& sets, hsTArray<UInt16>* edgeVerts);
    void            FindSharedVerts(plAccessSpan& span, int numEdgeVerts, hsTArray<UInt16>& edgeVerts, hsTArray<UInt16>& shareVtx, VtxAccum& accum);
    void            SetNormals(plAccessSpan& span, hsTArray<UInt16>& shareVtx, const hsVector3& norm) const;
    void            SetPositions(plAccessSpan& span, hsTArray<UInt16>& shareVtx, const hsPoint3& pos) const;
    void            SetDiffuse(plAccessSpan& span, hsTArray<UInt16>& shareVtx, const hsColorRGBA& diff) const;

public:
    plAccMeshSmooth() : fFlags(kSmoothNorm), fMinNormDot(0.25f), fDistTolSq(1.e-4f), fAccGeom() {}

    void        SetAngle(hsScalar degs);
    hsScalar    GetAngle() const; // returns degrees

    void        SetDistTol(hsScalar dist);
    hsScalar    GetDistTol() const;

    void        Smooth(hsTArray<plGeometrySpan*>& sets);

    void        SetFlags(UInt32 f) { fFlags = f; }
    UInt32      GetFlags() const { return fFlags; }
};

#endif // plAccMeshSmooth_inc