/*==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 hsSfxDistFade_inc
#define hsSfxDistFade_inc

#include "hsBiExpander.h"
#include "hsGRenderProcs.h"

class hsSfxDistFade : public hsGRenderProcs {
public:
    enum {
        kCullsBefore        = 0x10000,
        kCullsBeyond        = 0x20000,

        kDistFromView       = 0x40000,
        kDistFromTarget     = 0x80000,
        kDistAlongX         = 0x100000,
        kDistAlongY         = 0x200000,
        kDistAlongZ         = 0x400000,
        kWorldDist          = 0x800000,

        kPostInterp         = 0x1000000,

        kIdleBefore         = 0x2000000,
        kIdleBeyond         = 0x4000000
    };

    struct hsSfxDfTableEntry {
        hsScalar            fDistDel;
        hsScalar            fDistNorm;
        hsScalar            fOpacity;
    };
protected:

    hsScalar                            fMinDist;
    hsScalar                            fMaxDist;

    hsScalar                            fMinIdle;
    hsScalar                            fMaxIdle;

    hsExpander<hsSfxDfTableEntry>       fTable;

    hsScalar IOpacFromDist(hsScalar dist);
public:
    hsSfxDistFade();
    virtual ~hsSfxDistFade();

    virtual hsBool32 BeginObject(plPipeline* pipe, plDrawable* obj);

    virtual void ProcessPreInterpShadeVerts(hsExpander<hsGShadeVertex*>& vList);
    virtual void ProcessPostInterpShadeVerts(hsExpander<hsGShadeVertex*>& vList);

    void MakeTable(float* distList, float* opacList, int num); // lists sorted from lowest cosine to highest

    virtual void Read(hsStream* s);
    virtual void Write(hsStream* s);

    virtual const char* GetLabel() const { return "hsSfxDistFade"; }

    virtual ProcType GetType() const { return kTypeDistFade; }

    CLASSNAME_REGISTER( hsSfxDistFade );
    GETINTERFACE_ANY( hsSfxDistFade, hsGRenderProcs );

};

#endif // hsSfxDistFade_inc