CWE-ou-minkata/Sources/Plasma/PubUtilLib/plGRenderProcs/hsSfxObjDistShade.cpp

/*==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==*/

#include "hsTypes.h"
#include "hsMemory.h"
#include "hsSfxObjDistShade.h"
#include "hsStream.h"
#include "../plPipeline/plPipeline.h"
#include "../plGeometry/hsTriangle3.h"

#include "../plIntersect/hsBounds.h"
#include "../plDrawable/plDrawable.h"

static hsScalar globalScale = 1.f;

hsSfxObjDistShade::hsSfxObjDistShade()
: fMinDist(0), fMaxDist(0), fTreeCnt(0)
{
}

hsSfxObjDistShade::~hsSfxObjDistShade()
{
}

hsScalar hsSfxObjDistShade::IShadeFromDist(hsScalar dist)
{
    if( dist <= fTable[0].fDistDel )
        return fTable[0].fShade;

    int i;
    for( i = 0; (i < fTable.GetCount()) && (dist >= fTable[i].fDistDel); i++ )
        dist -= fTable[i].fDistDel;

    if( i >= fTable.GetCount() )
        return fTable[fTable.GetCount()-1].fShade;

    dist *= fTable[i-1].fDistNorm;
    hsScalar shade0 = fTable[i-1].fShade;
    hsScalar shade1 = fTable[i].fShade;

    return shade0 + dist * (shade1 - shade0);
}

hsBool32 hsSfxObjDistShade::ISetShade(plDrawable* refObj)
{
    hsPoint3 refPos;
    if( fFlags & kByBoundsCenter )
    {
        const hsBounds3Ext& bnd = refObj->GetWorldBounds();
        if( kBoundsNormal != bnd.GetType() )
            return true;
        refPos = bnd.GetCenter();
    }
    else
    {
        refObj->GetLocalToWorld().GetTranslate(&refPos);
    }
    
    hsPoint3 vPos;
    if( GetObjectRef(1) )
    {
        GetObjectRef(1)->GetLocalToWorld().GetTranslate(&vPos);
    }
    else
    {
        vPos = fPipeline->GetViewPositionWorld();
    }

    hsScalar dist = hsVector3(&vPos, &refPos).Magnitude();

    hsScalar shade = IShadeFromDist(dist);
    
    hsColorRGBA col = fColorizer.GetCurrentColor();
    if( fColorizer.Colorizing() )
    {
        col.r *= shade;
        col.g *= shade;
        col.b *= shade;
    }
    else
    {
        col.r = shade;
        col.g = shade;
        col.b = shade;
    }
    fColorizer.PushColorize(col, false);

    return true;
}



hsBool32 hsSfxObjDistShade::BeginObject(plPipeline* pipe, plDrawable* obj)
{
    hsGRenderProcs::BeginObject(pipe, obj);

    plDrawable* refObj = fFlags & kObjectRefs ? GetObjectRef(0) : nil;
    if( !refObj )
        refObj = obj;

    return ISetShade(refObj);
}

void hsSfxObjDistShade::MakeTable(float* distList, float* shadeList, int num)
{
    fTable.Reset();
    if( !num )
        return;

    int i;
    for( i = 0; i < num; i++ )
    {
        hsSfxDfTableEntry* t = fTable.Append();
        t->fDistDel = distList[i];
        t->fShade = shadeList[i];
    }
    for( i = num-1; i > 0; i-- )
        fTable[i].fDistDel -= fTable[i-1].fDistDel;
    for( i = 0; i < num-1; i++ )
        fTable[i].fDistNorm = hsScalarInvert(fTable[i+1].fDistDel);
    fTable[num-1].fDistNorm = 0;
    hsAssert(fTable.GetCount() == num, "Mismatch making table");

    int iMin;
    for( iMin = 0; (iMin < fTable.GetCount())&&(fTable[iMin].fShade <= 0); iMin++ );
    fMinDist = fTable[0].fDistDel;
    for( i = 1; i < iMin; i++ )
        fMinDist += fTable[i].fDistDel;

    int iMax;
    for( iMax = fTable.GetCount()-1; (iMax >= 0)&&(fTable[iMax].fShade <= 0); iMax-- );
    if( ++iMax >= fTable.GetCount() )
        iMax = fTable.GetCount()-1;
    fMaxDist = fTable[0].fDistDel;
    for( i = 1; i <= iMax; i++ )
        fMaxDist += fTable[i].fDistDel;

}

void hsSfxObjDistShade::Read(hsStream* s)
{
    fTable.Reset();

    fMinDist = s->ReadSwapScalar();
    fMaxDist = s->ReadSwapScalar();

    Int32 cnt = s->ReadSwap32();

    if( cnt )
    {
        hsSfxDfTableEntry* arr = new hsSfxDfTableEntry[cnt];
        int i;
        for( i = 0; i < cnt; i++ )
        {
            arr[i].fDistDel = s->ReadSwapScalar();
            arr[i].fDistNorm = s->ReadSwapScalar();
            arr[i].fShade = s->ReadSwapScalar();
        }

        fTable.SetArray(arr, cnt);
    }
}

void hsSfxObjDistShade::Write(hsStream* s)
{
    s->WriteSwapScalar(fMinDist);
    s->WriteSwapScalar(fMaxDist);

    s->WriteSwap32(fTable.GetCount());

    for( fTable.First(); fTable.More(); fTable.Plus() )
    {
        s->WriteSwapScalar(fTable.Current().fDistDel);
        s->WriteSwapScalar(fTable.Current().fDistNorm);
        s->WriteSwapScalar(fTable.Current().fShade);
    }
}