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

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*==LICENSE==*/

#include "hsTypes.h"
#include "hsMemory.h"
#include "hsSfxDistShade.h"
#include "hsStream.h"
#include "../plGeometry/hsTriangle3.h"

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

static hsScalar globalScale = 1.f;

hsSfxDistShade::hsSfxDistShade()
: fMinDist(0), fMaxDist(0)
{
}

hsSfxDistShade::~hsSfxDistShade()
{
}

hsScalar hsSfxDistShade::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 hsSfxDistShade::BeginObject(plPipeline* pipe, plDrawable* obj)
{
    hsGRenderProcs::BeginObject(pipe, obj);

    fFlags &= ~(kCulled | kNOP);

    hsPoint3 vPos;
    if( GetObjectRef(1) )
    {
        hsPoint3 wPos;
        GetObjectRef(1)->GetLocalToWorld().GetTranslate(&wPos);
        hsMatrix44 w2l = pipe->GetWorldToLocal();
        vPos = w2l * wPos;
    }
    else
    {
        vPos = pipe->GetViewPositionLocal();
    }
    hsVector3 vDir = -pipe->GetViewDirLocal();

    hsScalar scale = 1.f / fPipeline->GetLocalScale();
    scale *= globalScale;

    hsScalar vD = -(vDir.InnerProduct(vPos));
    vD *= scale;

    const hsBounds3Ext& bnd = obj->GetLocalBounds();

    hsPoint3 corner;
    bnd.GetCorner(&corner);
    hsVector3 axis[3];
    bnd.GetAxes(axis+0, axis+1, axis+2);

    hsScalar dist = vDir.InnerProduct(corner) + vD;
    hsScalar minDist = dist;
    hsScalar maxDist = dist;

    int i;
    for( i = 0; i < 3; i++ )
    {
        dist = vDir.InnerProduct(axis[i]);
        if( dist < 0 )
            minDist += dist;
        else
            maxDist += dist;
    }

    minDist *= scale;
    maxDist *= scale;

    fFlags &= ~kShadeConstant;
    if( maxDist < fMinDist )
    {
        fFlags |= kShadeConstant;
        fConstShade = fTable[0].fShade;
    }
    else if( minDist > fMaxDist )
    {
        fFlags |= kShadeConstant;
        fConstShade = fTable[fTable.GetCount()-1].fShade;
    }
    return true;
}

void hsSfxDistShade::ProcessPreInterpShadeVerts(hsExpander<hsGShadeVertex*>& vList)
{
    if( fFlags & kShadeConstant )
    {
        IConstShadeVerts(vList);
    }
    else
    {
        ICalcShadeVerts(vList);
    }
}

void hsSfxDistShade::IConstShadeVerts(hsExpander<hsGShadeVertex*>& vList)
{
    for( vList.First(); vList.More(); vList.Plus() )
    {
        hsGShadeVertex* svtx = vList.Current();
        svtx->fShade.r *= fConstShade;
        svtx->fShade.g *= fConstShade;
        svtx->fShade.b *= fConstShade;
    }
}

void hsSfxDistShade::ICalcShadeVerts(hsExpander<hsGShadeVertex*>& vList)
{
    hsPoint3 vPos;
    if( GetObjectRef(1) )
    {
        hsPoint3 wPos;
        GetObjectRef(1)->GetLocalToWorld().GetTranslate(&wPos);
        hsMatrix44 w2l = fPipeline->GetWorldToLocal();
        vPos = w2l * wPos;
    }
    else
    {
        vPos = fPipeline->GetViewPositionLocal();
    }
    hsVector3 vDir = fPipeline->GetViewDirLocal();

    hsScalar vDist = vDir.InnerProduct(vPos);

    hsScalar scale = 1.f / fPipeline->GetLocalScale();
    scale *= globalScale;
    
    for( vList.First(); vList.More(); vList.Plus() )
    {
        hsGShadeVertex* svtx = vList.Current();

        hsScalar dist = -vDir.InnerProduct(svtx->fLocalPos);
        dist += vDist;
        dist *= scale;

        hsScalar shade = IShadeFromDist(dist);

        if( shade > 0 )
        {
            svtx->fShade.r *= shade;
            svtx->fShade.g *= shade;
            svtx->fShade.b *= shade;
        }
        else
        {
            svtx->fShade.r = 0;
            svtx->fShade.g = 0;
            svtx->fShade.b = 0;
        }
    }
}

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

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

    int32_t cnt = s->ReadSwap32();

    if( cnt )
    {
        hsSfxDfTableEntry* arr = TRACKED_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 hsSfxDistShade::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);
    }
}