CWE-ou-minkata/Sources/Tools/MaxConvert/plLightMapGen.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
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along with this program.  If not, see <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

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combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
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*==LICENSE==*/

//#define MF_NEW_RGC

#include "hsTypes.h"
#include "Max.h"
#include "dummy.h"
#include "notify.h"

#include "plLightMapGen.h"
#include "plGImage/plMipmap.h"
#include "MaxMain/plMaxNode.h"
#include "MaxExport/plErrorMsg.h"
#include "plRenderGlobalContext.h"
#include "plMaxLightContext.h"
#include "plSurface/plLayer.h"
#include "plSurface/hsGMaterial.h"
#include "MaxMain/plPluginResManager.h"
#include "plDrawable/plGeometrySpan.h"
#include "hsFastMath.h"
#include "hsControlConverter.h"
#include "plBitmapCreator.h"
#include "pnKeyedObject/plKey.h"
#include "plResMgr/plKeyFinder.h"
#include "plResMgr/plPageInfo.h"

#include "plMessage/plLayRefMsg.h"
#include "plMessage/plMatRefMsg.h"

#include "MaxComponent/plLightMapComponent.h"

#include "plGImage/hsCodecManager.h"
#include "plAgeDescription/plAgeDescription.h"


static plLightMapGen theLMG;

static const float kBlurMapRange = 20.f;

#ifdef MF_NEW_RGC
void getRGC(void* param, NotifyInfo* info)
{
    if( info->intcode == NOTIFY_PRE_RENDERFRAME )
    {
        plLightMapGen* lmg = (plLightMapGen*)param;
        RenderGlobalContext* rgc = (RenderGlobalContext*)info->callParam;
        lmg->SetRGC(rgc);
    }
}
#endif // MF_NEW_RGC

#ifndef MF_NEW_RGC
#define MF_NO_RAY_SHADOW
#endif // MF_NEW_RGC

#define MF_NO_SHADOW_BLUR
#if defined(MF_NEW_RGC) && !defined(MF_NO_SHADOW_BLUR)
#define MF_NO_SHADOW_BLUR
#endif // MF_NEW_RGC

class LMGScanPoint
{
public:
    hsScalar            fU;
    hsPoint3            fBary;
};

class LMGScanlineData
{
public:
    LMGScanlineData() : fEmpty(true) {}

    hsBool              fEmpty;
    LMGScanPoint        fNear;
    LMGScanPoint        fFar;
};

static int kDefaultSize = 64;

static UInt32 MakeUInt32Color(float r, float g, float b, float a)
{
    return (UInt32(a * 255.9f) << 24)
            |(UInt32(r * 255.9f) << 16)
            |(UInt32(g * 255.9f) << 8)
            |(UInt32(b * 255.9f) << 0);
}

plLightMapGen& plLightMapGen::Instance()
{
    return theLMG;
}

#ifdef MF_NEW_RGC
// Don't call this ever ever ever. I mean really. Never.
void plLightMapGen::SetRGC(RenderGlobalContext* rgc) 
{ 
    fRGC = rgc; 
} 
#endif // MF_NEW_RGC

plLightMapGen::plLightMapGen()
:   fWidth(64),
    fHeight(64),
    fScale(1.f),
    fUVWSrc(-1),
    fMapRange(-1.f),
    fInterface(nil),
    fRenderer(nil),
    fRecalcLightMaps(true),
    fRGC(nil),
    fRP(nil)
{
    fWidth = kDefaultSize;
    fHeight = kDefaultSize;
}

plLightMapGen::~plLightMapGen()
{
    Close();
}

// Set up the structures we'll need to compute the lighting.
// You could turn off shadows by commenting out the call to
// MakeRenderInstances, since those are the guys that will
// cast shadows. Modify which lights contribute by changing
// the criteria in IFindLightsRecur.
hsBool plLightMapGen::Open(Interface* ip, TimeValue t, bool forceRegen)
{
    if( !fInterface && ip )
    {
        fInterface = ip;
        fTime = t;

        fRP = TRACKED_NEW RendParams;
        fRP->SetRenderElementMgr(fInterface->GetRenderElementMgr(RS_Production));

#ifdef MF_NEW_RGC
        RegisterNotification(
            getRGC, 
            this, 
            NOTIFY_PRE_RENDERFRAME
            );

        fRenderer = (Renderer*)CreateInstance(RENDERER_CLASS_ID, Class_ID(SREND_CLASS_ID,0));

        ViewParams vp;
        vp.prevAffineTM = Matrix3(true);
        vp.affineTM = Matrix3(true);
        vp.projType = PROJ_PERSPECTIVE;
        vp.hither = 1.f;
        vp.yon = 30.f;
        vp.distance = 1.f;
        vp.zoom = 1.f;
        vp.fov = hsScalarPI / 4.f;
        vp.nearRange = 1.f;
        vp.farRange = 30.f;

        fRenderer->Open(fInterface->GetRootNode(), 
            nil,
            &vp,
            *fRP, 
            fInterface->GetMAXHWnd());

        FrameRendParams frp;
        frp.ambient.Black();
        frp.background.Black();
        frp.globalLightLevel.Black();
        frp.frameDuration = 1.f;
        frp.relSubFrameDuration = 1.f;
        frp.regxmin = 0;
        frp.regxmax = 1;
        frp.regymin = 0;
        frp.regymax = 1;
        frp.blowupCenter = Point2(0.5f,0.5f);
        frp.blowupFactor = Point2(1.f, 1.f);

        BitmapInfo bminfo;
        bminfo.SetType(BMM_TRUE_32);
        bminfo.SetWidth(2);
        bminfo.SetHeight(2);
        bminfo.SetCustWidth(1);
        bminfo.SetCustHeight(1);
        if( !bminfo.Validate() )
        {
            // oops!
            return false;
        }

        Bitmap* tobm = TheManager->Create(&bminfo);


        fRenderer->Render(fTime, 
            tobm, 
            frp, 
            fInterface->GetMAXHWnd()
            );

        tobm->DeleteThis();

#else MF_NEW_RGC

        fRGC = TRACKED_NEW plRenderGlobalContext(fInterface, fTime);
        fRGC->MakeRenderInstances((plMaxNode*)fInterface->GetRootNode(), fTime);

#endif // MF_NEW_RGC

        fPreppedMipmaps.SetCount(0);
        fCreatedLayers.SetCount(0);
        fNewMaps.SetCount(0);

        fAllLights.SetCount(0);
        fActiveLights.SetCount(0);
        IFindLightsRecur((plMaxNode*)fInterface->GetRootNode());
    }
    fRecalcLightMaps = forceRegen;

    return fAllLights.GetCount() > 0;
}

hsBool plLightMapGen::Close()
{
    // HACK to get rid of keys held by the lightmap components, because
    // we can't delete the bitmaps in ICompressLightMaps unless these
    // refs are gone
    for (int i = 0; i < fSharedComponents.size(); i++)
    {
        if (fSharedComponents[i]->GetLightMapKey()) // if it has a key
            fSharedComponents[i]->SetLightMapKey(nil); // nil it out
    }
    fSharedComponents.clear();

    ICompressLightMaps();

#ifndef MF_NEW_RGC
    delete fRGC;
#else // MF_NEW_RGC
    if( fRenderer )
        fRenderer->Close(fInterface->GetMAXHWnd());
    fRenderer = nil;
#endif // MF_NEW_RGC
    fRGC = nil;
    delete fRP;
    fRP = nil;

    fPreppedMipmaps.SetCount(0);
    fCreatedLayers.SetCount(0);
    fNewMaps.SetCount(0);

    IReleaseActiveLights();
    IReleaseAllLights();

    fInterface = nil;

    return true;
}

//#define MIPMAP_LOG

#ifdef MIPMAP_LOG
void DumpMipmap(plMipmap* mipmap, const char* prefix)
{
    hsUNIXStream dump;
    char buf[256];
    sprintf(buf, "log\\%s.txt", prefix);
    dump.Open(buf, "wt");

    for (int i = 0; i < mipmap->GetNumLevels(); i++)
    {
        mipmap->SetCurrLevel(i);

        UInt32 width = mipmap->GetCurrWidth();
        UInt32 height = mipmap->GetCurrHeight();

        sprintf(buf, "----- Level %d (%dx%d) -----\n", i, width, height);
        dump.WriteString(buf);

        for (int y = 0; y < height; y++)
        {
            for (int x = 0; x < width; x++)
            {
                UInt32 color = *(mipmap->GetAddr32(x, y));
                UInt8 r = ((UInt8)((color)>>16));
                UInt8 g = ((UInt8)((color)>>8));
                UInt8 b = ((UInt8)((color)>>0));
                UInt8 a = ((UInt8)((color)>>24));
                sprintf(buf, "[%3d,%3d,%3d,%3d]", r, g, b, a);
                dump.WriteString(buf);
            }

            dump.WriteString("\n");
        }
    }

    dump.Close();
}
#endif // MIPMAP_LOG

hsBool plLightMapGen::ICompressLightMaps()
{
    int i;
    for( i = 0; i < fPreppedMipmaps.GetCount(); i++ )
    {
        plMipmap* orig = fPreppedMipmaps[i];

        if( orig )
        {
            const hsScalar kFilterSigma = 1.0f;

            if( IsFresh(orig) )
            {
                hsAssert(!orig->IsCompressed(), "How did we just generate a compressed texture?");
                orig->Filter(kFilterSigma);
            }

            if( !orig->IsCompressed() && !(orig->GetFlags() & plMipmap::kForceNonCompressed) )
            {
#ifdef MIPMAP_LOG
                DumpMipmap(orig, orig->GetKeyName());
#endif // MIPMAP_LOG

                plMipmap *compressed = 
                    hsCodecManager::Instance().CreateCompressedMipmap(plMipmap::kDirectXCompression, orig);

                if( compressed )
                {
                    const plLocation &textureLoc = plPluginResManager::ResMgr()->GetCommonPage(orig->GetKey()->GetUoid().GetLocation(),
                                                                                    plAgeDescription::kTextures );
                    char name[512];
                    sprintf(name, "%s_DX", orig->GetKey()->GetName());

                    plKey compKey = hsgResMgr::ResMgr()->FindKey(plUoid(textureLoc, plMipmap::Index(), name));
                    if( compKey )
                        plBitmapCreator::Instance().DeleteExportedBitmap(compKey);

                    hsgResMgr::ResMgr()->NewKey( name, compressed, textureLoc );

                    int j;
                    for( j = 0; j < fCreatedLayers.GetCount(); j++ )
                    {
                        if( orig == fCreatedLayers[j]->GetTexture() )
                        {
                            fCreatedLayers[j]->GetKey()->Release(orig->GetKey());
                            hsgResMgr::ResMgr()->AddViaNotify(compressed->GetKey(), TRACKED_NEW plLayRefMsg(fCreatedLayers[j]->GetKey(), plRefMsg::kOnReplace, 0, plLayRefMsg::kTexture), plRefFlags::kActiveRef);
                        }
                    }

                    plBitmapCreator::Instance().DeleteExportedBitmap(orig->GetKey());
                }
            }
        }
    }
    return true;
}

hsBool plLightMapGen::MakeMaps(plMaxNode* node, const hsMatrix44& l2w, const hsMatrix44& w2l, hsTArray<plGeometrySpan *> &spans, plErrorMsg *pErrMsg, plConvertSettings *settings)
{
    const char* dbgNodeName = node->GetName();

    plLightMapComponent* lmapComp = node->GetLightMapComponent();
    if( !lmapComp )
        return false;

    SetUVWSrc(lmapComp->GetUVWSrc());
    SetScale(lmapComp->GetScale());

    // If we don't want maps here, don't bother.
    if( !IWantsMaps(node) )
    {
        pErrMsg->Set(true, node->GetName(), "Lightmap generation requested on bogus object").CheckAndAsk();
        return false;
    }

    if( !IValidateUVWSrc(spans) )
    {
        pErrMsg->Set(true, node->GetName(), "Lightmap generation requested but UVW src bogus. Check mapping.").CheckAndAsk();
        return false;
    }

    // If there aren't any lights, don't bother
    if( !InitNode(node, false) )
    {
        pErrMsg->Set(true, node->GetName(), "Lightmap generation requested but no lights on object. Kind of wasteful.").CheckAndAsk();
        return true;
    }

    // If we have trouble getting a bitmap size, there's probably something wrong with the geometry
    if( !ISelectBitmapDimension(node, l2w, w2l, spans) )
    {
        pErrMsg->Set(true, node->GetName(), "Lightmap generation failure determining bitmap size, probably geometry problem.").CheckAndAsk();
        return false;
    }

    // Okay, we're going to do it. The lights are
    // set up for this guy so we just need some geometry.
    // Find the drawable and which spans correspond 
    // to this node, and feed them through. 
    //
    // IShadeGeometrySpans() and lower return whether any light was actually found.
    if( !IShadeGeometrySpans(node, l2w, w2l, spans) )
    {
        pErrMsg->Set(true, node->GetName(), "Lightmap generation requested but no light found on object. Kind of wasteful.").CheckAndAsk();
    }

    DeInitNode();

    return true;
}

// The next couple of functions don't do anything interesting except
// get us down to the face level where we can work.
hsBool plLightMapGen::IShadeGeometrySpans(plMaxNode* node, const hsMatrix44& l2w, const hsMatrix44& w2l, hsTArray<plGeometrySpan *> &spans)
{
    hsBool retVal = false;
    int i;
    for( i = 0; i < spans.GetCount(); i++ )
    {
        retVal |= IShadeSpan(node, l2w, w2l, *spans[i]);
    }
    return retVal;
}

hsBool plLightMapGen::IsFresh(plBitmap* map) const
{
    return fRecalcLightMaps || fNewMaps.Find(map) != fNewMaps.kMissingIndex;
}

hsBool plLightMapGen::IShadeSpan(plMaxNode* node, const hsMatrix44& l2w, const hsMatrix44& w2l, plGeometrySpan& span)
{
    // This will look for a suitable lightmap layer and return that. If there
    // isn't one already, it will set one up for us.
    plLayerInterface* lay = IGetLightMapLayer(node, span);
    // This next check should never happen, since we've created the layer ourselves.
    if( !lay || !lay->GetTexture() )//|| !lay->GetTexture()->GetBitmap() )
        return false;

    int i;

    if( !(span.fProps & plGeometrySpan::kDiffuseFoldedIn) )
    {
        hsBool foldin = 0 != (span.fProps & plGeometrySpan::kLiteVtxNonPreshaded);
        hsScalar opacity = 1.f;
        hsColorRGBA dif = hsColorRGBA().Set(1.f, 1.f, 1.f, 1.f);
        if( foldin )
        {
            // Find the opacity to fold in.
            // There should be one (or less) layers in this material using layer opacity,
            // or else we should have put this span as kLiteMaterial instead of kLiteVtxNonPreshaded,
            // so we're safe just getting the first opacity on a blended layer.
            // Likewise we're safe getting the first diffuse color that's not on an
            // emissive layer (since emissive layers ignore lightmapping).
            // If we are using kLiteMaterial, we still need to copy from InitColor to Stuff,
            // just don't do the modulate.
            for( i = 0; i < span.fMaterial->GetNumLayers(); i++ )
            {
                if( span.fMaterial->GetLayer(i)->GetBlendFlags() & hsGMatState::kBlendAlpha )
                {
                    opacity = span.fMaterial->GetLayer(i)->GetOpacity();
                    break;
                }
            }
            for( i = 0; i < span.fMaterial->GetNumLayers(); i++ )
            {
                if( !(span.fMaterial->GetLayer(i)->GetShadeFlags() & hsGMatState::kShadeEmissive) )
                {
                    dif = span.fMaterial->GetLayer(i)->GetRuntimeColor();
                    break;
                }
            }
        }
        for( i = 0; i < span.fNumVerts; i++ )
        {
            hsColorRGBA multColor, addColor;
            span.ExtractInitColor( i, &multColor, &addColor);
            if( foldin )
            {
                multColor *= dif;   // We like to use kVertexNonPreshaded for lightmapped objects, which needs the runtime diffuse folded in
                multColor.a *= opacity;
            }
            addColor.Set(0,0,0,0);
            span.StuffVertex(i, &multColor, &addColor);
        }
        if( span.fInstanceRefs )
        {
            int j;
            for( j = 0; j < span.fInstanceRefs->GetCount(); j++ )
            {
                plGeometrySpan* inst = (*span.fInstanceRefs)[j];
                inst->fProps |= plGeometrySpan::kDiffuseFoldedIn;
            }
        }
    }
    else
    {
        for( i = 0; i < span.fNumVerts; i++ )
        {
            hsColorRGBA multColor, addColor;
            span.ExtractInitColor( i, &multColor, &addColor);
            addColor.Set(0,0,0,0);
            span.StuffVertex(i, &multColor, &addColor);
        }
        return true;
    }

    // If we aren't recalculating all our lightmaps, then we only want to compute lightmaps
    // which have a creation time of now.
    if( !IsFresh(lay->GetTexture()) )
        return true;

    plMipmap* accum = IMakeAccumBitmap(lay);

    hsBool retVal = false;
    int nFaces = span.fNumIndices / 3;
    for( i = 0; i < nFaces; i++ )
    {
        retVal |= IShadeFace(node, l2w, w2l, span, i, accum);
    }

    IAddToLightMap(lay, accum);

    return retVal;
}

plMipmap* plLightMapGen::IMakeAccumBitmap(plLayerInterface* lay) const
{
    plMipmap* dst = plMipmap::ConvertNoRef( lay->GetTexture() );//->GetBitmap();
    hsAssert( dst != nil, "nil mipmap in IMakeAccumBitmap()" );

    int width = dst->GetWidth();
    int height = dst->GetHeight();

    // Temporary mipmap here, so we don't have to worry about using plBitmapCreator
    plMipmap* bitmap = TRACKED_NEW plMipmap( width, height, plMipmap::kRGB32Config, 1 );
    HSMemory::Clear(bitmap->GetImage(), bitmap->GetHeight() * bitmap->GetRowBytes() );

    return bitmap;
}

hsBool plLightMapGen::IAddToLightMap(plLayerInterface* lay, plMipmap* src) const
{
    plMipmap* dst = plMipmap::ConvertNoRef( lay->GetTexture() );//->GetBitmap();
    hsAssert( dst != nil, "nil mipmap in IAddToLightMap()" );

    src->SetCurrLevel( 0 );
    dst->SetCurrLevel( 0 );

    // BLURLATER
//  static hsScalar kFilterSigma = 0.5f;
//  src->Filter(kFilterSigma);

    // What we really want to do here is antialias our rasterization, so we can
    // just sum in contributions of lighting at the boarder between spans sharing
    // a light map. A quick hackaround is to use the max between existing color
    // (in dst) and current spans illumination contribution (in src).
    int i, j;
    for( j = 0; j < dst->GetHeight(); j++ )
    {
        for( i = 0; i < dst->GetWidth(); i++ )
        {
            UInt32 srcRed = (*src->GetAddr32(i, j) >> 16) & 0xff;
            UInt32 dstRed = (*dst->GetAddr32(i, j) >> 16) & 0xff;
//          dstRed += srcRed;
            if( dstRed < srcRed )
                dstRed = srcRed;
            if( dstRed > 0xff )
                dstRed = 0xff;

            UInt32 srcGreen = (*src->GetAddr32(i, j) >> 8) & 0xff;
            UInt32 dstGreen = (*dst->GetAddr32(i, j) >> 8) & 0xff;
//          dstGreen += srcGreen;
            if( dstGreen < srcGreen )
                dstGreen = srcGreen;
            if( dstGreen > 0xff )
                dstGreen = 0xff;

            UInt32 srcBlue = (*src->GetAddr32(i, j) >> 0) & 0xff;
            UInt32 dstBlue = (*dst->GetAddr32(i, j) >> 0) & 0xff;
//          dstBlue += srcBlue;
            if( dstBlue < srcBlue )
                dstBlue = srcBlue;
            if( dstBlue > 0xff )
                dstBlue = 0xff;

            *dst->GetAddr32(i, j) = 0xff000000
                | (dstRed << 16)
                | (dstGreen << 8)
                | (dstBlue << 0);
        }
    }
    dst->MakeDirty();

    delete src;

    return true;
}

hsBool plLightMapGen::IShadeFace(plMaxNode* node, const hsMatrix44& l2w, const hsMatrix44& w2l, plGeometrySpan& span, int iFace, plMipmap* bitmap)
{
    // Okay, here's where the metal hits the road, whatever that means.
    // We're going to get our bitmap, and step along the face texel by texel,
    // summing up the light at each texel and stuffing it in the bitmap.

    // Set up a light context for the shading below.
    Box3 bbox;
    node->EvalWorldState(fTime).obj->GetDeformBBox(fTime, bbox, &node->GetObjectTM(fTime));
    plMaxLightContext ctx(bbox, fTime);

    // First, get the face info we'll be using.

    // This will look for a suitable lightmap layer and return that. 
    // There should be one there already, because we called this
    // in IShadeSpan
    plLayerInterface* lay = IGetLightMapLayer(node, span);
    int iOurUv = IGetUVWSrc();
    // A little late to be checking this, but whatever...
    if( iOurUv < 0 )
        return false;

    int width = bitmap->GetWidth();
    int height = bitmap->GetHeight();

    hsMatrix44 norml2w;
    hsMatrix44 temp;

    l2w.GetInverse( &temp);
    temp.GetTranspose( &norml2w );

    hsPoint3 pt[3];
    hsVector3 norm[3];
    hsPoint3 uv[3];

    int i;
    for( i = 0; i < 3; i++ )
    {
        hsColorRGBA trash;

        span.ExtractVertex(span.fIndexData[iFace*3 + i], &pt[i], &norm[i], &trash);
        span.ExtractUv(span.fIndexData[iFace*3 + i], iOurUv, &uv[i]);

        pt[i] = l2w * pt[i];
    
        norm[i] = norml2w * norm[i];

        uv[i] = lay->GetTransform() * uv[i];

        uv[i].fX *= width-1;
        uv[i].fX += 0.5f;
        uv[i].fY *= height-1;
        uv[i].fY += 0.5f;

    }

    Color amb(0,0,0);

    return IShadeVerts(ctx, amb, pt, norm, uv, bitmap);
}

hsBool plLightMapGen::IShadeVerts(plMaxLightContext& ctx, const Color& amb, const hsPoint3 pt[3], const hsVector3 norm[3], const hsPoint3 uv[3], plMipmap* bitmap)
{
    int width = bitmap->GetWidth();
    int height = bitmap->GetHeight();
    bitmap->SetCurrLevel( 0 );

    hsTArray<LMGScanlineData> scanline;
    scanline.SetCount(height);

    int lowestV = height;
    int highestV = 0;
    int i0, i1, i2;
    for( i0 = 0; i0 < 3; i0++ )
    {
        i1 = i0 == 2 ? 0 : i0+1;
        i2 = i1 == 2 ? 0 : i1+1;

        hsScalar v0 = uv[i0].fY;
        hsScalar v1 = uv[i1].fY;

        int vStart = int(v0);
        int vEnd = int(v1);
        if( vStart == vEnd )
            continue;

        int vStep = vStart < vEnd ? 1 : -1;
        int vMid;
        for( vMid = vStart; vMid != vEnd + vStep; vMid += vStep )
        {
            // This shouldn't really happen, but might with some slop.
            if( (vMid < 0) || (vMid >= height) )
                continue;

            hsPoint3 bary;
            bary[i0] = (v1 - float(vMid)) / (v1 - v0);
            bary[i1] = 1.f - bary[i0];
            bary[i2] = 0;
            hsScalar u = uv[i0].fX * bary[i0]
                        + uv[i1].fX * bary[i1];
            if( scanline[vMid].fEmpty )
            {
                scanline[vMid].fNear.fU = u;
                scanline[vMid].fNear.fBary = bary;
                scanline[vMid].fFar = scanline[vMid].fNear;
                
                scanline[vMid].fEmpty = false;
                if( vMid < lowestV )
                    lowestV = vMid;
                if( vMid > highestV )
                    highestV = vMid;
            }
            else
            {
                if( u < scanline[vMid].fNear.fU )
                {
                    scanline[vMid].fNear.fU = u;
                    scanline[vMid].fNear.fBary = bary;
                }
                else if( u > scanline[vMid].fFar.fU )
                {
                    scanline[vMid].fFar.fU = u;
                    scanline[vMid].fFar.fBary = bary;
                }
            }
        }
    }
    int i;
    for( i = lowestV; i <= highestV; i++ )
    {
        if( !scanline[i].fEmpty )
        {
            int uStart = int(scanline[i].fNear.fU);
            if( uStart < 0 )
                uStart = 0;
            int uEnd = int(scanline[i].fFar.fU);
            if( uEnd >= width )
                uEnd = width - 1;
            if( uStart == uEnd )
                continue;
            int uMid;
            for( uMid = uStart; uMid <= uEnd; uMid++ )
            {
                hsScalar t = (scanline[i].fFar.fU - float(uMid)) / (scanline[i].fFar.fU - scanline[i].fNear.fU);
                hsPoint3 bary = scanline[i].fNear.fBary * t;
                bary += scanline[i].fFar.fBary * (1.f - t);

                hsPoint3 p = pt[0] * bary[0] + pt[1] * bary[1] + pt[2] * bary[2];
                hsVector3 n = norm[0] * bary[0] + norm[1] * bary[1] + norm[2] * bary[2];

                hsFastMath::NormalizeAppr(n);

                UInt32 color = IShadePoint(ctx, amb, p, n);
                *bitmap->GetAddr32(uMid, i) = color;

            }
        }
    }

    return true;
}

hsBool plLightMapGen::IGetLight(INode* node)
{
    if( node->UserPropExists("RunTimeLight") )
        return false;

    Object *obj = node->EvalWorldState(fTime).obj;

    if (obj && (obj->SuperClassID() == SClass_ID(LIGHT_CLASS_ID))) 
    {
        plLightMapInfo* liInfo = fAllLights.Push();

        LightObject* liObj = (LightObject*)obj;

        liInfo->fResetShadowType = 0;
        liInfo->fResetMapRange = -1.f;
        liInfo->fMapRange = -1.f;

        liInfo->fLiNode = node;
        liInfo->fObjLiDesc = nil;
        liInfo->fNewRender = true;

        return true;
    }

    return false;
}

hsBool plLightMapGen::Update(TimeValue t)
{
    fTime = t;

#ifndef MF_NEW_RGC
    if( fRGC )
        fRGC->Update(t);
#endif // MF_NEW_RGC

    return fAllLights.GetCount() != 0;
}

hsBool plLightMapGen::IFindLightsRecur(INode* node)
{
    IGetLight(node);

    int i;
    for( i = 0; i < node->NumberOfChildren(); i++ )
        IFindLightsRecur(node->GetChildNode(i));

    return fAllLights.GetCount() > 0;
}

hsBool plLightMapGen::InitNode(INode* node, hsBool softShadow)
{
    fActiveLights.SetCount(0);

    plMaxNode* maxNode = (plMaxNode*)node;
    if( !maxNode->CanConvert() )
        return false;

    if( maxNode->GetNoPreShade() )
        return false;

#ifndef MF_NO_SHADOW_BLUR
    fMapRange = softShadow ? kBlurMapRange : -1.f;
#endif // MF_NO_SHADOW_BLUR

    IFindActiveLights((plMaxNode*)node);
    
    return fActiveLights.GetCount() > 0;
}

hsBool plLightMapGen::DeInitNode()
{
    IReleaseActiveLights();

    return true;
}

hsBounds3Ext plLightMapGen::IGetBoundsLightSpace(INode* node, INode* liNode)
{
    TimeValue currTime(0);

    hsBounds3Ext bnd;
    bnd.MakeEmpty();
    Object *obj = node->EvalWorldState(currTime).obj;
    if( !obj )
        return bnd;

    Box3 box;

    if( obj->ClassID() == Class_ID(DUMMY_CLASS_ID,0) )
    {
        DummyObject* dummy = (DummyObject*)obj;
        box = dummy->GetBox();
    }
    else
    if( obj->CanConvertToType(triObjectClassID) )
    {
        TriObject   *meshObj = (TriObject *)obj->ConvertToType(currTime, triObjectClassID);
        if( !meshObj )
            return bnd;

        Mesh& mesh = meshObj->mesh;
        box = mesh.getBoundingBox();
        
        if( meshObj != obj )
            meshObj->DeleteThis();
    }

    bnd.Union(&hsPoint3(box.pmin.x, box.pmin.y, box.pmin.z));
    bnd.Union(&hsPoint3(box.pmax.x, box.pmax.y, box.pmax.z));

    Matrix3 maxL2W = node->GetObjectTM(currTime);
    Matrix3 maxW2Light = Inverse(liNode->GetObjectTM(currTime));
    Matrix3 maxL2Light = maxL2W * maxW2Light;
    hsMatrix44 l2l;
    hsControlConverter::Instance().Matrix3ToHsMatrix44(&maxL2Light, &l2l);


    bnd.Transform(&l2l);

    return bnd;
}

hsBool plLightMapGen::IDirAffectsNode(plLightMapInfo* liInfo, LightObject* liObj, INode* node)
{
    hsBounds3Ext bnd = IGetBoundsLightSpace(node, liInfo->fLiNode);

    if( bnd.GetType() != kBoundsNormal )
        return false;

    if( bnd.GetMins().fZ > 0 )
        return false;

    LightState ls;
    liObj->EvalLightState(TimeValue(0), FOREVER, &ls);

    hsScalar radX = ls.fallsize;
    hsScalar radY = radX;
    if( ls.shape == RECT_LIGHT )
        radY /= ls.aspect;

    if( bnd.GetMins().fX > radX )
        return false;
    if( bnd.GetMaxs().fX < -radX )
        return false;

    if( bnd.GetMins().fY > radY )
        return false;
    if( bnd.GetMaxs().fY < -radY )
        return false;

    if( !ls.useAtten )
        return true;

    if( bnd.GetMaxs().fZ < -ls.attenEnd )
        return false;

    return true;
}

hsBool plLightMapGen::ISpotAffectsNode(plLightMapInfo* liInfo, LightObject* liObj, INode* node)
{
    hsBounds3Ext bnd = IGetBoundsLightSpace(node, liInfo->fLiNode);

    if( bnd.GetType() != kBoundsNormal )
        return false;

    if( bnd.GetMins().fZ > 0 )
        return false;

    LightState ls;
    liObj->EvalLightState(TimeValue(0), FOREVER, &ls);

    hsScalar coneRad[2];
    coneRad[0] = ls.fallsize * hsScalarPI / 180.f;
    coneRad[1] = coneRad[0];
    if( ls.shape == RECT_LIGHT )
        coneRad[1] /= ls.aspect;

    hsPoint3 corners[8];
    bnd.GetCorners(corners);

    int numPos[4] = { 0, 0, 0, 0 };
    int j;
    for( j = 0; j < 8; j++ )
    {
        hsScalar rad;
        rad = hsScalar(atan2(corners[j].fX, -corners[j].fZ));
        if( rad > coneRad[0] )
            numPos[0]++;
        if( rad < -coneRad[0] )
            numPos[2]++;
        rad = hsScalar(atan2(corners[j].fY, -corners[j].fZ));
        if( rad > coneRad[1] )
            numPos[1]++;
        if( rad < -coneRad[1] )
            numPos[3]++;
    }
    for( j = 0; j < 4; j++ )
    {
        if( numPos[j] >= 8 )
            return false;
    }

    if( ls.useAtten )
    {
        if( bnd.GetMaxs().fZ < -ls.attenEnd )
            return false;
    }

    return true;
}

hsBool plLightMapGen::IOmniAffectsNode(plLightMapInfo* liInfo, LightObject* liObj, INode* node)
{
    LightState ls;
    liObj->EvalLightState(TimeValue(0), FOREVER, &ls);

    if( !ls.useAtten )
        return true;

    hsBounds3Ext bnd = IGetBoundsLightSpace(node, liInfo->fLiNode);

    if( bnd.GetType() != kBoundsNormal )
        return false;

    hsScalar radius = ls.attenEnd;

    int i;
    for( i = 0; i < 3; i++ )
    {
        if( bnd.GetMins()[i] > radius )
            return false;
        if( bnd.GetMaxs()[i] < -radius )
            return false;
    }

    return true;
}

hsBool plLightMapGen::ILightAffectsNode(plLightMapInfo* liInfo, LightObject* liObj, INode* node)
{
    const char* liName = liInfo->fLiNode->GetName();
    const char* nodeName = node->GetName();

    LightState ls;
    liObj->EvalLightState(TimeValue(0), FOREVER, &ls);

    hsBool excluded = false;
    if( !liObj->GetUseLight() )
    {
        excluded = true;
    }
    if( !excluded && liObj->GetExclList() && liObj->GetExclList()->TestFlag(NT_AFFECT_ILLUM) )
    {
        hsBool inExc = -1 != liObj->GetExclList()->FindNode(node);
        if( (!inExc) ^ (!liObj->GetExclList()->TestFlag(NT_INCLUDE)) )
            excluded = true;
    }
    if( excluded )
        return false;

    switch( ls.type )
    {
    case OMNI_LGT:
        return IOmniAffectsNode(liInfo, liObj, node);
    case SPOT_LGT:
        return ISpotAffectsNode(liInfo, liObj, node);
    case DIRECT_LGT:
        return IDirAffectsNode(liInfo, liObj, node);
    default:
    case AMBIENT_LGT:
        return true;
    }
    return false;
}

hsBool plLightMapGen::IPrepLight(plLightMapInfo* liInfo, INode* node)
{
    const char* liName = liInfo->fLiNode->GetName();
    const char* nodeName = node->GetName();

    INode* liNode = liInfo->fLiNode;
    LightObject* liObj = (LightObject*)liNode->EvalWorldState(fTime).obj;

    // redundant check, if it doesn't have a light object it shouldn't be in the list
    if( liObj )
    {
        hsBool affectsNode = ILightAffectsNode(liInfo, liObj, node);
        if( affectsNode )
        {

#ifdef MF_NO_RAY_SHADOW
            // for reasons known only to god and someone deep in the bowels of kinetix,
            // the lighting is (sometimes) barfing if the shadow type is ray-traced.
            // until i can track that down, i'll force shadow mapped shadows.
            liInfo->fResetShadowType = liObj->GetShadowType();
            if( liInfo->fResetShadowType > 0 )
            {
                liObj->SetShadowType(0);
                liInfo->fNewRender = true;
            }
#endif MF_NO_RAY_SHADOW
            if( fMapRange > 0 )
            {
                if( liInfo->fMapRange != fMapRange )
                {
                    liInfo->fResetMapRange = liObj->GetMapRange(fTime);
                    liObj->SetMapRange(fTime, fMapRange);
                    liInfo->fMapRange = fMapRange;
                    liInfo->fNewRender = true;
                }
            }
            else if( liInfo->fResetMapRange > 0 )
            {
                if( liInfo->fMapRange != liInfo->fResetMapRange )
                {
                    liObj->SetMapRange(fTime, liInfo->fResetMapRange);
                    liInfo->fMapRange = liInfo->fResetMapRange;
                    liInfo->fNewRender = true;
                }
            }
            
            ObjLightDesc* objLiDesc = liInfo->fObjLiDesc;
            if( !objLiDesc )
                objLiDesc = liObj->CreateLightDesc(liNode);
            
            plMaxRendContext rc;
            objLiDesc->Update(fTime, rc, fRGC, node->RcvShadows(), liInfo->fNewRender);
            objLiDesc->UpdateViewDepParams(Matrix3(true));
            
            liInfo->fNewRender = false;

            liInfo->fObjLiDesc = objLiDesc;
            
            fActiveLights.Append(liInfo);
        }
    }

    return true;
}

hsBool plLightMapGen::IFindActiveLights(plMaxNode* node)
{
    fActiveLights.SetCount(0);
    int i;
    for( i = 0; i < fAllLights.GetCount(); i++ )
    {
        IPrepLight(&fAllLights[i], node);
    }

    return fActiveLights.GetCount() > 0;
}

hsBool plLightMapGen::IReleaseAllLights()
{
    int i;
    for( i = 0; i < fAllLights.GetCount(); i++ )
    {
        if( fAllLights[i].fResetMapRange > 0 )
        {
            LightObject* liObj = (LightObject*)fAllLights[i].fLiNode->EvalWorldState(fTime).obj;
            liObj->SetMapRange(fTime, fAllLights[i].fResetMapRange);

        }
#ifdef MF_NO_RAY_SHADOW
        // Fix the shadow method back.
        if( fAllLights[i].fResetShadowType > 0 )
        {
            LightObject* liObj = (LightObject*)fAllLights[i].fLiNode->EvalWorldState(fTime).obj;
            liObj->SetShadowType(fAllLights[i].fResetShadowType);
        }
#endif // MF_NO_RAY_SHADOW

        if( fAllLights[i].fObjLiDesc )
            fAllLights[i].fObjLiDesc->DeleteThis();

        fAllLights[i].fObjLiDesc = nil;
    }
    fAllLights.SetCount(0);
    
    return true;
}

hsBool plLightMapGen::IReleaseActiveLights()
{
    fActiveLights.SetCount(0);

    return true;
}

hsBool plLightMapGen::IWantsMaps(plMaxNode* node)
{
    if( !(node->CanConvert() && node->GetDrawable()) )
        return false;

    return nil != node->GetLightMapComponent();
}

hsBool plLightMapGen::IValidateUVWSrc(hsTArray<plGeometrySpan *>& spans) const
{
    int i;
    for( i = 0; i < spans.GetCount(); i++ )
    {
        int numUVWs = spans[i]->GetNumUVs();
        if( IGetUVWSrc() >= numUVWs )
            return false;
    }
    return true;
}

void plLightMapGen::IInitBitmapColor(plMipmap* bitmap, const hsColorRGBA& col) const
{
    UInt32 initColor = MakeUInt32Color(col.r, col.g, col.b, col.a);
    UInt32* pix = (UInt32*)bitmap->GetImage();
    UInt32* pixEnd = ((UInt32*)bitmap->GetImage()) + bitmap->GetWidth() * bitmap->GetHeight();
    while( pix < pixEnd )
        *pix++ = initColor;
}

plLayerInterface* plLightMapGen::IGetLightMapLayer(plMaxNode* node, plGeometrySpan& span)
{
    plLayerInterface* lay = IMakeLightMapLayer(node, span);

    plMipmap* mip = plMipmap::ConvertNoRef(lay->GetTexture());
    hsAssert(mip, "This should have been a mipmap we created ourselves.");
    if( !mip )
        return nil;
    if( fPreppedMipmaps.Find(mip) == fPreppedMipmaps.kMissingIndex )
    {
        if( IsFresh(mip) )
        {
            hsColorRGBA initColor = node->GetLightMapComponent()->GetInitColor();
            // Get this off the node, where the lightmap component has stashed it.
            IInitBitmapColor(mip, initColor);
        }

        fPreppedMipmaps.Append(mip);
    }
    if( fCreatedLayers.Find(lay) == fCreatedLayers.kMissingIndex )
    {
        fCreatedLayers.Append(lay);
    }
    return lay;
}

plLayerInterface* plLightMapGen::IMakeLightMapLayer(plMaxNode* node, plGeometrySpan& span)
{
    hsGMaterial* mat = span.fMaterial;

    int i;
    for( i = 0; i < mat->GetNumPiggyBacks(); i++ )
    {
        if( mat->GetPiggyBack(i)->GetMiscFlags() & hsGMatState::kMiscLightMap )
            return mat->GetPiggyBack(i);
    }

    char newMatName[256];
    sprintf(newMatName, "%s_%s_LIGHTMAPGEN", mat->GetKey()->GetName(), node->GetName());
    plLocation nodeLoc = node->GetLocation();

    plKey matKey = hsgResMgr::ResMgr()->FindKey(plUoid(nodeLoc, hsGMaterial::Index(), newMatName));
    if( matKey )
    {
        mat = hsGMaterial::ConvertNoRef(matKey->ObjectIsLoaded());
        for( i = 0; i < mat->GetNumPiggyBacks(); i++ )
        {
            if( mat->GetPiggyBack(i)->GetMiscFlags() & hsGMatState::kMiscLightMap )
            {
                span.fMaterial = mat;
                return mat->GetPiggyBack(i);
            }
        }
        hsAssert(false, "Something not a light map material registered with our name?");
    }
    hsGMaterial* objMat = nil;
    
    hsBool sharemaps = node->GetLightMapComponent()->GetShared();
    if( sharemaps )
    {
        objMat = mat;
    }
    else
    {
        objMat = TRACKED_NEW hsGMaterial;
        hsgResMgr::ResMgr()->NewKey(newMatName, objMat, nodeLoc);

        for( i = 0; i < mat->GetNumLayers(); i++ )
            hsgResMgr::ResMgr()->AddViaNotify(mat->GetLayer(i)->GetKey(), TRACKED_NEW plMatRefMsg(objMat->GetKey(), plRefMsg::kOnCreate, -1, plMatRefMsg::kLayer), plRefFlags::kActiveRef);
    }

    objMat->SetCompositeFlags(objMat->GetCompositeFlags() | hsGMaterial::kCompIsLightMapped);

    // Make sure layer (and mip) name are unique across pages by putting the page name in
    const plPageInfo* pageInfo = plKeyFinder::Instance().GetLocationInfo(node->GetLocation());

    char layName[256];
    sprintf(layName, "%s_%s_LIGHTMAPGEN", pageInfo->GetPage(), node->GetName());
    
    plKey layKey = node->FindPageKey(plLayer::Index(), layName);


    if( !layKey )
    {
        int w = fWidth;
        int h = fHeight;

        plKey mipKey;
        if( node->GetLightMapComponent()->GetLightMapKey() )
        {
            mipKey = node->GetLightMapComponent()->GetLightMapKey();
        }
        else
        {
            char mipmapName[ 256 ];
            sprintf( mipmapName, "%s_mip", layName );

            // Deleted the NOTE here because it was incorrect in every meaningful sense of the word. - mf

            const plLocation &textureLoc = plPluginResManager::ResMgr()->GetCommonPage( nodeLoc, plAgeDescription::kTextures );

            mipKey = hsgResMgr::ResMgr()->FindKey(plUoid(textureLoc, plMipmap::Index(), mipmapName));

            if( !mipKey && !fRecalcLightMaps )
            {
                char compressedName[512];
                sprintf(compressedName, "%s_DX", mipmapName);

                plKey compKey = hsgResMgr::ResMgr()->FindKey(plUoid(textureLoc, plMipmap::Index(), compressedName));

                if( compKey )
                    mipKey = compKey;
            }

            if( mipKey )
            {
                plBitmap* bitmap = plBitmap::ConvertNoRef(mipKey->ObjectIsLoaded());
                if( bitmap )
                {
                    if( node->GetLightMapComponent()->GetCompress() != bitmap->IsCompressed() )
                    {
                        // make sure the lightmap component isn't holding a key,
                        // it will get assigned one a few lines later anyway
                        if (node->GetLightMapComponent()->GetLightMapKey())
                            node->GetLightMapComponent()->SetLightMapKey(nil);

                        plBitmapCreator::Instance().DeleteExportedBitmap(mipKey);
                    }
                }
            }

            if( !mipKey )
            {
                plMipmap* bitmap = plBitmapCreator::Instance().CreateBlankMipmap(w, h, plMipmap::kRGB32Config, 1, mipmapName, nodeLoc);
                mipKey = bitmap->GetKey();
                fNewMaps.Append(bitmap);

                if( !node->GetLightMapComponent()->GetCompress() )
                    bitmap->SetFlags(bitmap->GetFlags() | plMipmap::kForceNonCompressed);
            }
            if( node->GetLightMapComponent()->GetShared() )
            {
                // HACK since we are setting the key, save the pointer to the light map
                // component so we can get rid of the key it holds later
                fSharedComponents.push_back(node->GetLightMapComponent());

                node->GetLightMapComponent()->SetLightMapKey(mipKey);
            }
        }

        plLayer* layer = TRACKED_NEW plLayer;
        layer->InitToDefault();
        layKey = hsgResMgr::ResMgr()->NewKey(layName, layer, nodeLoc);
        hsgResMgr::ResMgr()->AddViaNotify(mipKey, TRACKED_NEW plLayRefMsg(layer->GetKey(), plRefMsg::kOnCreate, 0, plLayRefMsg::kTexture), plRefFlags::kActiveRef);
        layer->SetAmbientColor(hsColorRGBA().Set(1.f, 1.f, 1.f, 1.f));
        layer->SetZFlags(hsGMatState::kZNoZWrite);
        layer->SetBlendFlags(hsGMatState::kBlendMult);
        layer->SetClampFlags(hsGMatState::kClampTexture);
        layer->SetUVWSrc(IGetUVWSrc());
        layer->SetMiscFlags(hsGMatState::kMiscLightMap);
    }

    hsgResMgr::ResMgr()->AddViaNotify(layKey, TRACKED_NEW plMatRefMsg(objMat->GetKey(), plRefMsg::kOnCreate, -1, plMatRefMsg::kPiggyBack), plRefFlags::kActiveRef);

    span.fMaterial = objMat;


    return plLayerInterface::ConvertNoRef(layKey->GetObjectPtr());

}

// Like ShadePoint, but only computes the amount of light striking the surface,
// so ignoring the N dot L term.
Color plLightMapGen::ShadowPoint(plMaxLightContext& ctx)
{
    ctx.globContext = fRGC;

    Color accum;
    accum.Black();
    int i;
    for( i = 0; i < fActiveLights.GetCount(); i++ )
    {
        const char* dbgLiName = fActiveLights[i]->fLiNode->GetName();

        Color color;
        Point3 liDir;
        float dot_nl, diffuseCoef;
        BOOL hit = fActiveLights[i]->fObjLiDesc->Illuminate(ctx, ctx.Normal(), color, liDir, dot_nl, diffuseCoef);
        if( hit )
        {
            accum += color;
        }
    }

    return accum;
}

Color plLightMapGen::ShadePoint(plMaxLightContext& ctx)
{
    ctx.globContext = fRGC;

    Color accum;
    accum.Black();
    int i;
    for( i = 0; i < fActiveLights.GetCount(); i++ )
    {
        Color color;
        Point3 liDir;
        float dot_nl, diffuseCoef;
        BOOL hit = fActiveLights[i]->fObjLiDesc->Illuminate(ctx, ctx.Normal(), color, liDir, dot_nl, diffuseCoef);
        if( hit )
        {
            accum += color * diffuseCoef;
        }
    }

    return accum;
}

Color plLightMapGen::ShadePoint(plMaxLightContext& ctx, const Point3& p, const Point3& n)
{
    ctx.SetPoint(p, n);

    return ShadePoint(ctx);

}

Color plLightMapGen::ShadePoint(plMaxLightContext& ctx, const hsPoint3& p, const hsVector3& n)
{
    ctx.SetPoint(p, n);

    return ShadePoint(ctx);

}

UInt32 plLightMapGen::IShadePoint(plMaxLightContext& ctx, const Color& amb, const hsPoint3& p, const hsVector3& n)
{
    ctx.globContext = fRGC;
    ctx.SetPoint(p, n);

    Color accum = ShadePoint(ctx);
    accum += amb;
    accum.ClampMinMax();

    UInt32 retVal;

    retVal = MakeUInt32Color(accum.r, accum.g, accum.b, 1.f);

    return retVal;
}

hsBool plLightMapGen::ISelectBitmapDimension(plMaxNode* node, const hsMatrix44& l2w, const hsMatrix44& w2l, hsTArray<plGeometrySpan *>& spans)
{
    float duDr = 0;
    float dvDr = 0;

    float totFaces = 0;

    int i;
    for( i = 0; i < spans.GetCount(); i++ )
    {
        plGeometrySpan *span = spans[i];

        int nFaces = span->fNumIndices / 3;
        int j;
        for( j = 0; j < nFaces; j++ )
        {
            hsPoint3 pt[3];
            hsPoint3 uv[3];

            int k;
            for( k = 0; k < 3; k++ )
            {
                hsVector3 vTrash;
                hsColorRGBA cTrash;

                span->ExtractVertex(span->fIndexData[j*3 + k], &pt[k], &vTrash, &cTrash);

                pt[k] = l2w * pt[k];

                span->ExtractUv(span->fIndexData[j*3 + k], IGetUVWSrc(), &uv[k]);
            }

            if( (uv[0].fX >= 1.f)
                &&(uv[1].fX >= 1.f)
                &&(uv[2].fX >= 1.f) )
                continue;

            if( (uv[0].fY >= 1.f)
                &&(uv[1].fY >= 1.f)
                &&(uv[2].fY >= 1.f) )
                continue;

            if( (uv[0].fX <= 0)
                &&(uv[1].fX <= 0)
                &&(uv[2].fX <= 0) )
                continue;

            if( (uv[0].fY <= 0)
                &&(uv[1].fY <= 0)
                &&(uv[2].fY <= 0) )
                continue;

            float magDU[2];
            magDU[0] = fabsf(uv[1].fX - uv[0].fX);
            magDU[1] = fabsf(uv[2].fX - uv[0].fX);
            if( magDU[0] > magDU[1] )
            {
                float dist = hsVector3(pt+1, pt+0).Magnitude();

                if( dist > 1.e-3f )
                    duDr += magDU[0] / dist;
            }
            else
            {
                float dist = hsVector3(pt+2, pt+0).Magnitude();

                if( dist > 1.e-3f )
                    duDr += magDU[1] / dist;
            }

            float magDV[2];
            magDV[0] = fabsf(uv[1].fY - uv[0].fY);
            magDV[1] = fabsf(uv[2].fY - uv[0].fY);
            if( magDV[0] > magDV[1] )
            {
                float dist = hsVector3(pt+1, pt+0).Magnitude();

                if( dist > 1.e-3f )
                    dvDr += magDV[0] / dist;
            }
            else
            {
                float dist = hsVector3(pt+2, pt+0).Magnitude();

                if( dist > 1.e-3f )
                    dvDr += magDV[1] / dist;
            }

            totFaces++;
        }
    }

    if( totFaces < 1.f )
        return false;

    duDr /= totFaces;
    dvDr /= totFaces;

    const int kMaxSize = 256;
    const int kMinSize = 32;
    const int kMaxAspect = 8;

    const float kTexPerFoot = 1.f;

    if( duDr > 0 )
    {
        fWidth = kTexPerFoot / duDr;

        if( fWidth > kMaxSize )
            fWidth = kMaxSize;
        if( fWidth < kMinSize )
            fWidth = kMinSize;
    }
    else
    {
        fWidth = kMinSize;
    }
    fWidth *= fScale;
    fWidth = IPowerOfTwo(fWidth);
    
    if( dvDr > 0 )
    {
        fHeight = kTexPerFoot / duDr;

        if( fHeight > kMaxSize )
            fHeight = kMaxSize;
        if( fHeight < kMinSize )
            fHeight = kMinSize;
    }
    else
    {
        fHeight = kMinSize;
    }
    fHeight *= fScale;
    fHeight = IPowerOfTwo(fHeight);

    if( fHeight / fWidth > kMaxAspect )
        fWidth = fHeight / kMaxAspect;
    if( fWidth / fHeight > kMaxAspect )
        fHeight = fWidth / kMaxAspect;

    if( fWidth > 512 )
        fWidth = 512;
    if( fHeight > 512 )
        fHeight = 512;

    return true;
}

int plLightMapGen::IPowerOfTwo(int sz) const
{
    int i = 0;
    while( (1 << i) < sz )
        i++;

    int p2sz = 1 << i;

    if( p2sz - sz > sz - (p2sz >> 1) )
        p2sz >>= 1;

    return p2sz;
}