CWE-ou-minkata/Sources/Plasma/PubUtilLib/plGLight/plLightInfo.cpp

/*==LICENSE==*

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Copyright (C) 2011  Cyan Worlds, Inc.

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*==LICENSE==*/

#include "HeadSpin.h"
#include "plLightInfo.h"
#include "plLightKonstants.h"
#include "hsBounds.h"
#include "hsStream.h"
#include "hsResMgr.h"
#include "pnMessage/plNodeRefMsg.h"
#include "plgDispatch.h"
#include "plIntersect/plVolumeIsect.h"
#include "plDrawable/plSpaceTree.h"
#include "plDrawable/plDrawableGenerator.h"
#include "plDrawable/plDrawableSpans.h"
#include "plPipeline/hsGDeviceRef.h"
#include "plPipeline/plRenderTarget.h"
#include "hsFastMath.h"
#include "pnSceneObject/plDrawInterface.h"
#include "plSurface/plLayerInterface.h"
#include "plSurface/plLayer.h"
#include "plSurface/hsGMaterial.h"
#include "plGImage/plMipmap.h"
#include "plMessage/plRenderMsg.h"
#include "plMessage/plRenderRequestMsg.h"
#include "plScene/plRenderRequest.h"
#include "plPipeline.h"
#include "plIntersect/plSoftVolume.h"
#include "plPipeline/plPipeDebugFlags.h"
#include "pnMessage/plPipeResMakeMsg.h"

#include "plScene/plVisRegion.h"
#include "plScene/plVisMgr.h"

// heinous
#include "plNetClient/plNetClientMgr.h"
#include "pnMessage/plEnableMsg.h"
static float kMaxYon = 1000.f;
static float kMinHither = 1.f;

#include "plLightProxy.h"

#include "plDrawable/plDrawableGenerator.h"

plLightInfo::plLightInfo()
:   fSceneNode(nil),
    fDeviceRef(nil),
    fVolFlags(0),
    fProjection(nil),
    fSoftVolume(nil)
{
    fLightToWorld.Reset();
    fWorldToLight.Reset();

    fLocalToWorld.Reset();
    fWorldToLocal.Reset();

    fLightToLocal.Reset();
    fLocalToLight.Reset();

    fWorldToProj.Reset();

    fNextDevPtr = nil;
    fPrevDevPtr = nil;

    fProxyGen = new plLightProxy;
    fProxyGen->Init(this);

    fRegisteredForRenderMsg = false;

    fVisSet.SetBit(plVisMgr::kNormal);
}

plLightInfo::~plLightInfo()
{
    if( fNextDevPtr != nil || fPrevDevPtr != nil )
        Unlink();

    hsRefCnt_SafeUnRef( fDeviceRef );

    if( fRegisteredForRenderMsg )
    {
        plgDispatch::Dispatch()->UnRegisterForExactType(plRenderMsg::Index(), GetKey());
        plgDispatch::Dispatch()->UnRegisterForExactType(plPipeRTMakeMsg::Index(), GetKey());
        fRegisteredForRenderMsg = false;
    }

    delete fProxyGen;
}

void plLightInfo::SetDeviceRef( hsGDeviceRef *ref )
{
    hsRefCnt_SafeAssign( fDeviceRef, ref ); 
}

void plLightInfo::IRefresh()
{
    ICheckMaxStrength();
    if( fDeviceRef )
        fDeviceRef->SetDirty( true );
}

void plLightInfo::ICheckMaxStrength()
{
    float r = GetDiffuse().r >= 0 ? GetDiffuse().r : -GetDiffuse().r;
    float g = GetDiffuse().g >= 0 ? GetDiffuse().g : -GetDiffuse().g;
    float b = GetDiffuse().b >= 0 ? GetDiffuse().b : -GetDiffuse().b;
    fMaxStrength = 
        r > g 
        ?   (
            r > b
                ? r
                : b
            )
        :   (
            g > b
                ? g
                : b
            );

    const float kMinMaxStrength = 1.e-2f;
    SetZero(fMaxStrength < kMinMaxStrength);
}

void plLightInfo::GetStrengthAndScale(const hsBounds3Ext& bnd, float& strength, float& scale) const
{
    if( IsIdle() )
    {
        strength = scale = 0.f;
        return;
    }

    strength = fMaxStrength;

    scale = 1.f;
    if( fSoftVolume )
    {
        scale = fSoftVolume->GetStrength(bnd.GetCenter());
        strength *= scale;

    }
    return;     
}

void plLightInfo::GetAffectedForced(const plSpaceTree* space, hsBitVector& list, bool charac)
{
    Refresh();

    if( IGetIsect() )
    {
        space->HarvestLeaves(IGetIsect(), list);
    }
    else
    {
        list.Set(space->GetNumLeaves());
    }
}

void plLightInfo::GetAffected(const plSpaceTree* space, hsBitVector& list, bool charac)
{
    Refresh();

    if( IsIdle() )
        return;

    if( !GetProperty(kLPHasIncludes) || (GetProperty(kLPIncludesChars) && charac) )
    {
        if( IGetIsect() )
        {
            space->HarvestLeaves(IGetIsect(), list);
        }
        else
        {
            list.Set(space->GetNumLeaves());
        }
    }
}

const hsTArray<int16_t>& plLightInfo::GetAffected(plSpaceTree* space, const hsTArray<int16_t>& visList, hsTArray<int16_t>& litList, bool charac)
{
    Refresh();

    if( !IsIdle() )
    {
        if( !GetProperty(kLPHasIncludes) || (GetProperty(kLPIncludesChars) && charac) )
        {
            if( IGetIsect() )
            {
                static hsBitVector cache;
                cache.Clear();
                space->EnableLeaves(visList, cache);

                space->HarvestEnabledLeaves(IGetIsect(), cache, litList);

                return litList;
            }
            else
            {
                return visList;
            }
        }
    }

    litList.SetCount(0);
    return litList;
}

//// Set/GetProperty /////////////////////////////////////////////////////////
//  Sets/gets a property just like the normal Set/GetNativeProperty, but the 
//  flag taken in is from plDrawInterface, not our props flags. So we have to 
//  translate...

void plLightInfo::SetProperty( int prop, bool on )
{
    plObjInterface::SetProperty(prop, on);
    if( kDisable == prop )
        fProxyGen->SetDisable(on);
}

//// SetSpecular /////////////////////////////////////////////////////////////
//  A bit more complicated here--make sure we set/clear the kLPHasSpecular
//  flag so we can test more easily for such a condition.

void plLightInfo::SetSpecular( const hsColorRGBA& c ) 
{ 
    fSpecular = c; 

    if( fSpecular.r == 0.f && fSpecular.g == 0.f && fSpecular.b == 0.f )
        SetProperty( kLPHasSpecular, false );
    else
        SetProperty( kLPHasSpecular, true );

    SetDirty(); 
}

void plLightInfo::SetTransform(const hsMatrix44& l2w, const hsMatrix44& w2l)
{
    fLocalToWorld = l2w;
    fWorldToLocal = w2l;

    fLightToWorld = l2w * fLightToLocal; 
    fWorldToLight = fLocalToLight * w2l; 

    if( IGetIsect() )
        IGetIsect()->SetTransform(fLightToWorld, fWorldToLight);

    if( fDeviceRef != nil )
        fDeviceRef->SetDirty( true );

    fProxyGen->SetTransform(fLightToWorld, fWorldToLight);

    SetDirty(true);

    if( GetProjection() )
    {
        Refresh();
        hsMatrix44 w2proj = IGetWorldToProj();
        plLayer* lay = plLayer::ConvertNoRef(GetProjection()->BottomOfStack());
        if( lay )
        {
            lay->SetTransform(w2proj);
        }
    }
}

void plLightInfo::SetLocalToLight(const hsMatrix44& l2lt, const hsMatrix44& lt2l)
{
    fLocalToLight = l2lt;
    fLightToLocal = lt2l;
}

const hsMatrix44& plLightInfo::GetLocalToWorld() const
{
    return fLocalToWorld;
}

const hsMatrix44& plLightInfo::GetWorldToLocal() const
{
    return fWorldToLocal;
}

const hsMatrix44& plLightInfo::GetLightToWorld() const
{
    return fLightToWorld;
}

const hsMatrix44& plLightInfo::GetWorldToLight() const
{
    return fWorldToLight;
}

#include "plProfile.h"
plProfile_CreateTimer("Light Info", "RenderSetup", LightInfo);

void plLightInfo::IAddVisRegion(plVisRegion* reg)
{
    if( reg )
    {
        int idx = fVisRegions.Find(reg);
        if( fVisRegions.kMissingIndex == idx )
        {
            fVisRegions.Append(reg);
            if( reg->GetProperty(plVisRegion::kIsNot) )
                fVisNot.SetBit(reg->GetIndex());
            else
            {
                fVisSet.SetBit(reg->GetIndex());
                if( reg->ReplaceNormal() )
                    fVisSet.ClearBit(plVisMgr::kNormal);
            }
        }
    }
}

void plLightInfo::IRemoveVisRegion(plVisRegion* reg)
{
    if( reg )
    {
        int idx = fVisRegions.Find(reg);
        if( fVisRegions.kMissingIndex != idx )
        {
            fVisRegions.Remove(idx);
            if( reg->GetProperty(plVisRegion::kIsNot) )
                fVisNot.ClearBit(reg->GetIndex());
            else
                fVisSet.ClearBit(reg->GetIndex());
        }
    }
}


bool plLightInfo::MsgReceive(plMessage* msg)
{
    plRenderMsg* rendMsg = plRenderMsg::ConvertNoRef(msg);
    if( rendMsg )
    {
        plProfile_BeginLap(LightInfo, this->GetKey()->GetUoid().GetObjectName().c_str());

        if( !fDeviceRef && !GetProperty(kLPShadowOnly) )
        {
            rendMsg->Pipeline()->RegisterLight( this );
        }

        ICheckMaxStrength();

        plProfile_EndLap(LightInfo, this->GetKey()->GetUoid().GetObjectName().c_str());
        return true;
    }
    plGenRefMsg* refMsg = plGenRefMsg::ConvertNoRef(msg);
    if( refMsg )
    {
        if( refMsg->GetContext() & (plRefMsg::kOnCreate|plRefMsg::kOnRequest|plRefMsg::kOnReplace) )
        {
            switch( refMsg->fType )
            {
            case kProjection:
                fProjection = plLayerInterface::ConvertNoRef(refMsg->GetRef());
                {
                    if( GetKey() && !GetKey()->GetName().CompareN("RTPatternLight", strlen("RTPatternLight")) )
                        SetProperty(kLPForceProj, true);
                }
                break;
            case kSoftVolume:
                fSoftVolume = plSoftVolume::ConvertNoRef(refMsg->GetRef());
                break;
            case kVisRegion:
                IAddVisRegion(plVisRegion::ConvertNoRef(refMsg->GetRef()));
                break;
            }
        }
        else if( refMsg->GetContext() & (plRefMsg::kOnRemove | plRefMsg::kOnDestroy) )
        {
            switch( refMsg->fType )
            {
            case kProjection:
                fProjection = nil;
                break;
            case kSoftVolume:
                fSoftVolume = nil;
                break;
            case kVisRegion:
                IRemoveVisRegion(plVisRegion::ConvertNoRef(refMsg->GetRef()));
                break;
            }
        }
        return true;
    }
    plPipeRTMakeMsg* rtMake = plPipeRTMakeMsg::ConvertNoRef(msg);
    if( rtMake )
    {
        // Make sure we're registered with the pipeline
        // If we're only here to cast shadows, just don't tell anyone
        // about us.
        if( !fDeviceRef && !GetProperty(kLPShadowOnly) )
        {
            rtMake->Pipeline()->RegisterLight( this );
        }
        return true;
    }
    plEnableMsg* enaMsg = plEnableMsg::ConvertNoRef(msg);
    if( enaMsg )
    {
        SetProperty(kDisable, enaMsg->Cmd(plEnableMsg::kDisable));
        return true;
    }
    


    return plObjInterface::MsgReceive(msg);
}


void plLightInfo::Read(hsStream* s, hsResMgr* mgr)
{
    hsRefCnt_SafeUnRef( fDeviceRef );
    fDeviceRef = nil;

    plObjInterface::Read(s, mgr);

    fAmbient.Read(s);
    fDiffuse.Read(s);
    fSpecular.Read(s);

    fLightToLocal.Read(s);
    fLocalToLight.Read(s);

    fLightToWorld.Read(s);
    fWorldToLight.Read(s);

    fLocalToWorld = fLightToWorld * fLocalToLight;
    fWorldToLocal = fLightToLocal * fWorldToLight;

    mgr->ReadKeyNotifyMe(s, new plGenRefMsg(GetKey(), plRefMsg::kOnCreate, 0, kProjection), plRefFlags::kActiveRef);

    mgr->ReadKeyNotifyMe(s, new plGenRefMsg(GetKey(), plRefMsg::kOnCreate, 0, kSoftVolume), plRefFlags::kActiveRef);

    // Let our sceneNode know we're here.
    plKey nodeKey = mgr->ReadKey(s);
    ISetSceneNode(nodeKey);

    int n = s->ReadLE32();
    fVisRegions.SetCountAndZero(n);
    int i;
    for( i = 0; i < n; i++ )
        mgr->ReadKeyNotifyMe(s, new plGenRefMsg(GetKey(), plRefMsg::kOnCreate, 0, kVisRegion), plRefFlags::kActiveRef);

    SetDirty(true);
}

void plLightInfo::Write(hsStream* s, hsResMgr* mgr)
{
    plObjInterface::Write(s, mgr);

    fAmbient.Write(s);
    fDiffuse.Write(s);
    fSpecular.Write(s);

    fLightToLocal.Write(s);
    fLocalToLight.Write(s);

    fLightToWorld.Write(s);
    fWorldToLight.Write(s);

    mgr->WriteKey(s, GetProjection());

    mgr->WriteKey(s, fSoftVolume);

    mgr->WriteKey(s, fSceneNode);

    s->WriteLE32(fVisRegions.GetCount());
    int i;
    for( i = 0; i < fVisRegions.GetCount(); i++ )
        mgr->WriteKey(s, fVisRegions[i]);
}

// These two should only be called by the SceneObject
void plLightInfo::ISetSceneNode(plKey node)
{
    if( node != fSceneNode )
    {
        if( node )
        {
            plNodeRefMsg* refMsg = new plNodeRefMsg(node, plRefMsg::kOnCreate, -1, plNodeRefMsg::kLight);
            hsgResMgr::ResMgr()->AddViaNotify(GetKey(), refMsg, plRefFlags::kPassiveRef);
        }
        if( fSceneNode )
        {
            fSceneNode->Release(GetKey());
        }
    }
    fSceneNode = node;

    if( fSceneNode != nil )
    {
        if( !fRegisteredForRenderMsg )
        {
            plgDispatch::Dispatch()->RegisterForExactType(plRenderMsg::Index(), GetKey());
            plgDispatch::Dispatch()->RegisterForExactType(plPipeRTMakeMsg::Index(), GetKey());
            fRegisteredForRenderMsg = true;
        }
    }
    else if( fRegisteredForRenderMsg )
    {
        plgDispatch::Dispatch()->UnRegisterForExactType(plRenderMsg::Index(), GetKey());
        plgDispatch::Dispatch()->UnRegisterForExactType(plPipeRTMakeMsg::Index(), GetKey());
        fRegisteredForRenderMsg = false;
    }
}

plKey plLightInfo::GetSceneNode() const
{
    return fSceneNode;
}

//// Link & Unlink ///////////////////////////////////////////////////////

void    plLightInfo::Unlink( void )
{
    hsAssert( fPrevDevPtr, "Light info not in list" );
    if( fNextDevPtr )
        fNextDevPtr->fPrevDevPtr = fPrevDevPtr;
    *fPrevDevPtr = fNextDevPtr;

    fNextDevPtr = nil;
    fPrevDevPtr = nil;
}

void    plLightInfo::Link( plLightInfo **back )
{
    hsAssert( fNextDevPtr == nil && fPrevDevPtr == nil, "Trying to link a lightInfo that's already linked" );

    fNextDevPtr = *back;
    if( *back )
        (*back)->fPrevDevPtr = &fNextDevPtr;
    fPrevDevPtr = back;
    *back = this;
}

//////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////
///// Standard light types
//////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////
// Directional

plDirectionalLightInfo::plDirectionalLightInfo()
{
}

plDirectionalLightInfo::~plDirectionalLightInfo()
{
}

void plDirectionalLightInfo::GetStrengthAndScale(const hsBounds3Ext& bnd, float& strength, float& scale) const
{
    plLightInfo::GetStrengthAndScale(bnd, strength, scale);
}

void plDirectionalLightInfo::Read(hsStream* s, hsResMgr* mgr)
{
    plLightInfo::Read(s, mgr);
}

void plDirectionalLightInfo::Write(hsStream* s, hsResMgr* mgr)
{
    plLightInfo::Write(s, mgr);
}


hsVector3 plDirectionalLightInfo::GetWorldDirection() const
{ 
    return -fLightToWorld.GetAxis( hsMatrix44::kUp );
}

//////////////////////////////////////////////////////////////////////////
// Limited Directional
plLimitedDirLightInfo::plLimitedDirLightInfo()
:   fParPlanes(nil)
{
}

plLimitedDirLightInfo::~plLimitedDirLightInfo()
{
    delete fParPlanes;
}

void plLimitedDirLightInfo::IRefresh()
{
    plLightInfo::IRefresh();

    if( !IGetIsect() )
        IMakeIsect();

    if( GetProjection() )
    {
        hsMatrix44 l2ndc;
        l2ndc.Reset();

        float width = fWidth;
        float height = fHeight;

        l2ndc.fMap[0][0] = 1.f / width;
        l2ndc.fMap[0][3] = 0.5f;

        l2ndc.fMap[1][1] = -1.f / height;
        l2ndc.fMap[1][3] = 0.5f;

        // Map Screen Z to range 0 (at hither) to 1 (at yon)
        // No, map z dead on to 1.f
        l2ndc.fMap[2][2] = 1.f / fDepth;
        l2ndc.fMap[2][3] = 0;

        l2ndc.fMap[3][3] = 1.f;
        l2ndc.NotIdentity();

        fWorldToProj = l2ndc * fWorldToLight;
    }
}

void plLimitedDirLightInfo::GetStrengthAndScale(const hsBounds3Ext& bnd, float& strength, float& scale) const
{
    // If we haven't culled the object, return that we're full strength.
    plLightInfo::GetStrengthAndScale(bnd, strength, scale);
}

void plLimitedDirLightInfo::Read(hsStream* s, hsResMgr* mgr)
{
    plDirectionalLightInfo::Read(s, mgr);

    fWidth = s->ReadLEScalar();
    fHeight = s->ReadLEScalar();
    fDepth = s->ReadLEScalar();
}

void plLimitedDirLightInfo::Write(hsStream* s, hsResMgr* mgr)
{
    plDirectionalLightInfo::Write(s, mgr);

    s->WriteLEScalar(fWidth);
    s->WriteLEScalar(fHeight);
    s->WriteLEScalar(fDepth);
}

void plLimitedDirLightInfo::IMakeIsect()
{
    if( !fParPlanes )
        fParPlanes = new plParallelIsect;

    fParPlanes->SetNumPlanes(3);
    
    hsPoint3 p0, p1;

    float width = fWidth;
    float height = fHeight;
    p0.Set(-width*0.5f, 0, 0);
    p1.Set(width*0.5f, 0, 0);
    fParPlanes->SetPlane(0, p0, p1);

    p0.Set(0, -height * 0.5f, 0);
    p1.Set(0, height * 0.5f, 0);
    fParPlanes->SetPlane(1, p0, p1);

    p0.Set(0, 0, 0);
    p1.Set(0, 0, -fDepth);
    fParPlanes->SetPlane(2, p0, p1);

    fParPlanes->SetTransform(fLightToWorld, fWorldToLight);
}

//// ICreateProxy //////////////////////////////////////////////////////
//  Creates a new box drawable for showing the light's
//  influence.

plDrawableSpans* plLimitedDirLightInfo::CreateProxy(hsGMaterial* mat, hsTArray<uint32_t>& idx, plDrawableSpans* addTo)
{
    hsPoint3 corner;
    corner.Set(-fWidth*0.5f, -fHeight*0.5f, -fDepth);
    hsVector3 vecs[3];
    vecs[0].Set(fWidth, 0, 0);
    vecs[1].Set(0, fHeight, 0);
    vecs[2].Set(0, 0, fDepth);
        // Generate a rectangular drawable based on a corner and three vectors
    plDrawableSpans* draw = plDrawableGenerator::GenerateBoxDrawable( corner, vecs[0], vecs[1], vecs[2], 
                                                            mat, 
                                                            fLightToWorld, 
                                                            true,
                                                            nil,
                                                            &idx, 
                                                            addTo );

    return draw;
}



//////////////////////////////////////////////////////////////////////////
// Omni
plOmniLightInfo::plOmniLightInfo()
:   fAttenConst(0),
    fAttenLinear(1.f),
    fAttenQuadratic(0),
    fAttenCutoff(0),
    fSphere(nil)
{
}

plOmniLightInfo::~plOmniLightInfo()
{
    delete fSphere;
}

void plOmniLightInfo::IMakeIsect()
{
    fSphere = new plSphereIsect;
    fSphere->SetTransform(fLightToWorld, fWorldToLight);
}

void plOmniLightInfo::GetStrengthAndScale(const hsBounds3Ext& bnd, float& strength, float& scale) const
{
    plLightInfo::GetStrengthAndScale(bnd, strength, scale);

    // Volume - Want to base this on the closest point on the bounds, instead of just the center.
    const hsPoint3& pos = bnd.GetCenter();

    hsPoint3 wpos = GetWorldPosition();
    float dist = hsVector3(&pos, &wpos).MagnitudeSquared();
    dist = 1.f / hsFastMath::InvSqrtAppr(dist);
    if( fAttenQuadratic > 0 )
    {
        strength /= (fAttenConst + fAttenLinear * dist + fAttenQuadratic * dist * dist);
    }
    else if( fAttenLinear > 0 )
    {
        strength /= (fAttenConst + fAttenLinear * dist);
    }
    else if( fAttenConst > 0 )
    {
        strength /= fAttenConst;
    }
    else if( fAttenCutoff > 0 )
    {
        if( dist > fAttenCutoff )
            strength = 0;
    }
}

float plOmniLightInfo::GetRadius() const
{
    float radius = 0;
    if( fAttenQuadratic > 0 )
    {
        float mult = fDiffuse.a >= 0 ? fDiffuse.a : -fDiffuse.a;
        float det = fAttenLinear*fAttenLinear - 4.f * fAttenQuadratic * fAttenConst * (1.f - mult * plSillyLightKonstants::GetFarPowerKonst());
        if( det > 0 )
        {
            det = sqrt(det);

            radius = -fAttenLinear + det;
            radius /= fAttenQuadratic * 2.f;
            if( radius < 0 )
                radius = 0;
        }
    }
    else if( fAttenLinear > 0 )
    {
        float mult = fDiffuse.a >= 0 ? fDiffuse.a : -fDiffuse.a;
        radius = (mult * plSillyLightKonstants::GetFarPowerKonst() - 1.f ) * fAttenConst / fAttenLinear;
    }
    else if( fAttenCutoff > 0 )
    {
        radius = fAttenCutoff;
    }

    return radius;
}

void plOmniLightInfo::IRefresh()
{
    plLightInfo::IRefresh();

    if( IsAttenuated() )
    {
        if( !fSphere )
            IMakeIsect();
        fSphere->SetRadius(GetRadius());
    }
    else
    {
        delete fSphere;
        fSphere = nil;
    }
}

hsVector3 plOmniLightInfo::GetNegativeWorldDirection(const hsPoint3& pos) const
{
    hsPoint3 wpos = GetWorldPosition();
    hsVector3 tmp(&wpos, &pos);
    return hsFastMath::NormalizeAppr(tmp);
}

void plOmniLightInfo::Read(hsStream* s, hsResMgr* mgr)
{
    plLightInfo::Read(s, mgr);

    fAttenConst = s->ReadLEScalar();
    fAttenLinear = s->ReadLEScalar();
    fAttenQuadratic = s->ReadLEScalar();
    fAttenCutoff = s->ReadLEScalar();
}

void plOmniLightInfo::Write(hsStream* s, hsResMgr* mgr)
{
    plLightInfo::Write(s, mgr);

    s->WriteLEScalar(fAttenConst);
    s->WriteLEScalar(fAttenLinear);
    s->WriteLEScalar(fAttenQuadratic);
    s->WriteLEScalar( fAttenCutoff );
}


//// ICreateProxy //////////////////////////////////////////////////////
//  Creates a new sphere drawable for showing the omnilight's
//  sphere (haha) of influence.

plDrawableSpans* plOmniLightInfo::CreateProxy(hsGMaterial* mat, hsTArray<uint32_t>& idx, plDrawableSpans* addTo)
{
    float   rad = GetRadius();
    if( rad == 0 )
        rad = 50;

    plDrawableSpans* draw = plDrawableGenerator::GenerateSphericalDrawable(hsPoint3(0,0,0), 
                                                        rad, 
                                                        mat, 
                                                        fLightToWorld, 
                                                        true,
                                                        nil,
                                                        &idx,
                                                        addTo);

    return draw;
}


//////////////////////////////////////////////////////////////////////////
// Spot
plSpotLightInfo::plSpotLightInfo()
:   fFalloff(1.f),
    fSpotInner(M_PI * 0.125f),
    fSpotOuter(M_PI * 0.25f),
    fCone(nil)
{
}

plSpotLightInfo::~plSpotLightInfo()
{
    delete fCone;
}

void plSpotLightInfo::GetStrengthAndScale(const hsBounds3Ext& bnd, float& strength, float& scale) const
{
    plOmniLightInfo::GetStrengthAndScale(bnd, strength, scale);

    // Volume - Want to base this on the closest point on the bounds, instead of just the center.
    const hsPoint3& pos = bnd.GetCenter();
    
    hsVector3 del;
    hsPoint3 wpos = GetWorldPosition();
    del.Set(&pos, &wpos);
    float invDist = del.MagnitudeSquared();
    invDist = hsFastMath::InvSqrtAppr(invDist);

    float dot = del.InnerProduct(GetWorldDirection());
    dot *= invDist;

    float cosInner, cosOuter, t;
    hsFastMath::SinCosInRangeAppr(fSpotInner, t, cosInner);
    hsFastMath::SinCosInRangeAppr(fSpotOuter, t, cosOuter);
    if( dot < cosOuter )
        strength = 0;
    else if( dot < cosInner )
        strength *= (dot - cosOuter) / (cosInner - cosOuter);
}

void plSpotLightInfo::IMakeIsect()
{
    fCone = new plConeIsect;
    fCone->SetTransform(fLightToWorld, fWorldToLight);
}

void plSpotLightInfo::IRefresh()
{
    plLightInfo::IRefresh();

    if( !fCone )
        IMakeIsect();

    float effFOV = fSpotOuter;
    fCone->SetAngle(effFOV);
    

    if( IsAttenuated() )
    {
        fCone->SetLength(GetRadius());
        fCone->SetTransform(fLightToWorld, fWorldToLight);
    }

    if( GetProjection() )
    {
        float yon = GetRadius();
        if( yon < kMinHither )
            yon = kMaxYon;
        float hither = hsMinimum(kMinHither, yon * 0.5f);

        float sinFOV, cosFOV;
        hsFastMath::SinCos(effFOV, sinFOV, cosFOV);

        hsMatrix44 l2ndc;
        l2ndc.Reset();
        l2ndc.fMap[0][0] =   cosFOV / sinFOV * 0.5f;
        l2ndc.fMap[0][2] = -0.5f;
        l2ndc.fMap[1][1] =  -cosFOV / sinFOV * 0.5f;
        l2ndc.fMap[1][2] = -0.5f;
        l2ndc.fMap[2][2] =  -yon / (yon - hither);
        l2ndc.fMap[3][3] =  0;
        l2ndc.fMap[3][2] =  -1.f;

        l2ndc.NotIdentity();

        fWorldToProj = l2ndc * fWorldToLight;
    }
}

void plSpotLightInfo::Read(hsStream* s, hsResMgr* mgr)
{
    plOmniLightInfo::Read(s, mgr);

    fFalloff = s->ReadLEScalar();
    fSpotInner = s->ReadLEScalar();
    fSpotOuter = s->ReadLEScalar();
}

void plSpotLightInfo::Write(hsStream* s, hsResMgr* mgr)
{
    plOmniLightInfo::Write(s, mgr);

    s->WriteLEScalar(fFalloff);
    s->WriteLEScalar(fSpotInner);
    s->WriteLEScalar(fSpotOuter);
}


hsVector3 plSpotLightInfo::GetWorldDirection() const
{ 
    return -fLightToWorld.GetAxis( hsMatrix44::kUp );
}

//// ICreateProxy //////////////////////////////////////////////////////
//  Generates a new drawable for showing the spotlight's
//  sphere of influence.

plDrawableSpans* plSpotLightInfo::CreateProxy(hsGMaterial* mat, hsTArray<uint32_t>& idx, plDrawableSpans* addTo)
{
    float   rad = GetRadius();
    float   x, y;


    if( rad == 0 )
        rad = 80;

    hsFastMath::SinCosAppr( GetSpotOuter(), x, y );

    plDrawableSpans* draw = plDrawableGenerator::GenerateConicalDrawable(rad * x / y, -rad, 
                                                        mat, 
                                                        fLightToWorld, 
                                                        true,
                                                        nil,
                                                        &idx,
                                                        addTo);
    return draw;
}