/*==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 plTriUtils_inc
#define plTriUtils_inc

class plTriUtils
{
public:
    enum Bary {
        kInsideTri      = 0x0,
        kOnVertex0      = 0x1,
        kOnVertex1      = 0x2,
        kOnVertex2      = 0x4,
        kOnVertex       = kOnVertex0 | kOnVertex1 | kOnVertex2,
        kOnEdge01       = 0x8,
        kOnEdge12       = 0x10,
        kOnEdge02       = 0x20,
        kOnEdge         = kOnEdge01 | kOnEdge12 | kOnEdge02,

        kOutsideTri     = 0x100,

        kDegenerateTri  = 0x200,
    };


protected:
    Bary IComputeBarycentric(const hsVector3& v12, hsScalar invLenSq12, const hsVector3& v0, const hsVector3& v1, hsPoint3& out);

    int ISelectAxis(const hsVector3& norm);
    hsBool IFastBarycentric(int iAx, const hsPoint3& p0, const hsPoint3& p1, const hsPoint3& p2, const hsPoint3&p, hsPoint3& out);
public:

    Bary ComputeBarycentricProjection(const hsPoint3& p0, const hsPoint3& p1, const hsPoint3& p2, hsPoint3&p, hsPoint3& out);
    Bary ComputeBarycentric(const hsPoint3& p0, const hsPoint3& p1, const hsPoint3& p2, const hsPoint3&p, hsPoint3& out);


    hsBool FastBarycentricProjection(const hsPoint3& p0, const hsPoint3& p1, const hsPoint3& p2, hsPoint3&p, hsPoint3& out);
    hsBool FastBarycentric(const hsPoint3& p0, const hsPoint3& p1, const hsPoint3& p2, const hsPoint3&p, hsPoint3& out);

    hsBool ProjectOntoPlane(const hsVector3& norm, hsScalar dist, hsPoint3& p);
    hsBool ProjectOntoPlane(const hsPoint3& p0, const hsPoint3& p1, const hsPoint3& p2, hsPoint3& p);
    hsBool ProjectOntoPlaneAlongVector(const hsVector3& norm, hsScalar dist, const hsVector3& vec, hsPoint3& p);
    hsBool ProjectOntoPlaneAlongVector(const hsPoint3& p0, const hsPoint3& p1, const hsPoint3& p2, const hsVector3& vec, hsPoint3& p);

};

#endif // plTriUtils_inc