CWE-ou-minkata/Sources/Plasma/FeatureLib/pfSurface/plFadeOpacityMod.cpp

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*==LICENSE==*/

#include "HeadSpin.h"
#include "plFadeOpacityMod.h"

#include "plFadeOpacityLay.h"

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

#include "plSurface/hsGMaterial.h"

#include "plDrawable/plVisLOSMgr.h"
#include "plDrawable/plAccessGeometry.h"
#include "plDrawable/plAccessSpan.h"
#include "plDrawable/plDrawableSpans.h"

#include "pnSceneObject/plSceneObject.h"
#include "pnSceneObject/plDrawInterface.h"

#include "plScene/plVisMgr.h"

#include "plgDispatch.h"
#include "plPipeline.h"
#include "hsBounds.h"
#include "hsTimer.h"
#include "hsResMgr.h"

/*
    curr = (t - t0) / fadeUp;
    curr = 1. - (t - t0) / fadeDown;

    switch from fadeUp to fadeDown
    curr = 1 - (t - t0) / fadeDown;
    t - t0 = (1 - curr) * fadeDown
    t0 = t - (1 - curr) * fadeDown;

    switch from fadeDown to fadeUp
    curr = (t - t0) / fadeUp;
    curr * fadeUp = t - t0;
    t0 = t - curr * fadeUp;
*/

hsBool plFadeOpacityMod::fLOSCheckDisabled = false;

const float kDefFadeUp(5.f);
const float kDefFadeDown(1.f);

plFadeOpacityMod::plFadeOpacityMod()
:   fFadeUp(kDefFadeUp),
    fFadeDown(kDefFadeDown),
    fOpCurrent(1.f),
    fStart(0),
    fFade(kImmediate),
    fLastEye(0.f, 0.f, 0.f),
    fSetup(false)
{
}

plFadeOpacityMod::~plFadeOpacityMod()
{
}

hsBool plFadeOpacityMod::MsgReceive(plMessage* msg)
{
    plRenderMsg* rend = plRenderMsg::ConvertNoRef(msg);
    if( rend )
    {
        IOnRenderMsg(rend);
        return true;
    }
    return plSingleModifier::MsgReceive(msg);
}

void plFadeOpacityMod::SetKey(plKey k)
{
    hsKeyedObject::SetKey(k);
    if( k )
    {
        plgDispatch::Dispatch()->RegisterForExactType(plRenderMsg::Index(), GetKey());
    }
}


void plFadeOpacityMod::Read(hsStream* s, hsResMgr* mgr)
{
    plSingleModifier::Read(s, mgr);

    fFadeUp = s->ReadLEScalar();
    fFadeDown = s->ReadLEScalar();
}

void plFadeOpacityMod::Write(hsStream* s, hsResMgr* mgr)
{
    plSingleModifier::Write(s, mgr);

    s->WriteLEScalar(fFadeUp);
    s->WriteLEScalar(fFadeDown);
}

void plFadeOpacityMod::SetTarget(plSceneObject* so)
{
    plSingleModifier::SetTarget(so);

    fSetup = false;
}

hsBool plFadeOpacityMod::IShouldCheck(plPipeline* pipe)
{
    if (pipe->TestVisibleWorld(GetTarget()))
        return true;

    fFade = kImmediate;

    return false;
}

void plFadeOpacityMod::IOnRenderMsg(plRenderMsg* rend)
{
    // Okay, are we set up enough to proceed?
    if( !IReady() )
        return;

    // Okay, we're going to check.

    hsBool hit = false;

    if( !fLOSCheckDisabled )
    {
        // Should we check to see if we're visible before anything else?
        if( !IShouldCheck(rend->Pipeline()) )
            return;

        hsPoint3 eyePos = rend->Pipeline()->GetViewPositionWorld();
        hsPoint3 ourPos = IGetOurPos();

        if( fFade != kImmediate )
        {
            // If we've moved more than 3 feet in a frame, we'll consider this a 
            // camera cut. In that case, don't fade up or down, just go there.
            const float kCutMagSquared = 3.f * 3.f;
            if( hsVector3(&eyePos, &fLastEye).MagnitudeSquared() > kCutMagSquared )
                fFade = kImmediate;
        }
        fLastEye = eyePos;

        // Cast the ray from eye to us.
        plVisHit hitInfo;
        hit = plVisLOSMgr::Instance()->Check(eyePos, ourPos, hitInfo);
    }

    // If the ray made it, fade us up
    // Else fade us down.
    if( !hit )
        IFadeUp();
    else
        IFadeDown();

    ISetOpacity();
}

hsBool plFadeOpacityMod::IReady()
{
    plSceneObject* so = GetTarget();
    if( !so )
        return false;

    if( !so->GetDrawInterface() )
        return false;

    if( !fSetup )
        ISetup(so);

    if( !fFadeLays.GetCount() )
        return false;

    return true;
}

hsPoint3 plFadeOpacityMod::IGetOurPos()
{
    hsAssert(GetTarget(), "Weed out target-less earlier");

    if( HasFlag(kBoundsCenter) )
    {
        return GetTarget()->GetDrawInterface()->GetWorldBounds().GetCenter();
    }
    else
    {
        return GetTarget()->GetLocalToWorld().GetTranslate();
    }
}

void plFadeOpacityMod::ICalcOpacity()
{
    double t = hsTimer::GetSysSeconds();
    switch( fFade )
    {
    case kFadeUp:
        fOpCurrent = (float)(t - fStart);
        if( fOpCurrent > fFadeUp )
        {
            fOpCurrent = 1.f;
            fFade = kUp;
        }
        else
        {
            fOpCurrent /= fFadeUp;
        }
        break;
    case kFadeDown:
        fOpCurrent = (float)(t - fStart);
        if( fOpCurrent > fFadeDown )
        {
            fOpCurrent = 0.f;
            fFade = kDown;
        }
        else
        {
            fOpCurrent = 1.f - fOpCurrent / fFadeDown;
        }
        break;
    case kUp:
    case kDown:
        break;
    case kImmediate:
    default:
        hsAssert(false, "Invalid state");
        break;
    };
}

void plFadeOpacityMod::ISetOpacity()
{
    ICalcOpacity();

    const int num = fFadeLays.GetCount();
    int i;
    for( i = 0; i < num; i++ )
        fFadeLays[i]->SetOpacity(fOpCurrent);   
}

void plFadeOpacityMod::IFadeUp()
{
    const double t = hsTimer::GetSysSeconds();
    switch( fFade )
    {
    case kImmediate:
        fOpCurrent = 1.f;
        fFade = kUp;
        break;
    case kFadeDown:
        {
            fStart = t - fOpCurrent * fFadeUp;

            fFade = kFadeUp;
        }
        break;
    case kDown:
        {
            fStart = t;
            fFade = kFadeUp;
        }
        break;
    case kUp:
    case kFadeUp:
        break;
    default:
        hsAssert(false, "Bad State");
        break;
    };
}

void plFadeOpacityMod::IFadeDown()
{
    const double t = hsTimer::GetSysSeconds();
    switch( fFade )
    {
    case kImmediate:
        fOpCurrent = 0.f;
        fFade = kDown;
        break;
    case kFadeUp:
        {
            fStart = t - (1.f - fOpCurrent) * fFadeDown;

            fFade = kFadeDown;
        }
        break;
    case kUp:
        {
            fStart = t;
            fFade = kFadeDown;
        }
    case kFadeDown:
    case kDown:
        break;
    default:
        hsAssert(false, "Bad State");
        break;
    };
}

void plFadeOpacityMod::ISetup(plSceneObject* so)
{
    fFadeLays.Reset();
    
    if( !so )
        return;

    const plDrawInterface* di = so->GetDrawInterface();
    if( !di )
        return;

    hsTArray<plAccessSpan> src;
    plAccessGeometry::Instance()->OpenRO(di, src, false);

    int i;
    for( i = 0; i < src.GetCount(); i++ )
    {
        hsGMaterial* mat = src[i].GetMaterial();

        int j;
        for( j = 0; j < mat->GetNumLayers(); j++ )
        {
            plLayerInterface* lay = mat->GetLayer(j);
            if( !j || !(lay->GetZFlags() & hsGMatState::kZNoZWrite) || (lay->GetMiscFlags() & hsGMatState::kMiscRestartPassHere) )
            {
                plFadeOpacityLay* fade = new plFadeOpacityLay();

                hsgResMgr::ResMgr()->NewKey(lay->GetKey()->GetName(), fade, lay->GetKey()->GetUoid().GetLocation());

                fade->AttachViaNotify(lay);

                // We should add a ref or something here if we're going to hold on to this (even though we created and "own" it).
                fFadeLays.Append(fade);

                plMatRefMsg* msg = new plMatRefMsg(mat->GetKey(), plRefMsg::kOnReplace, i, plMatRefMsg::kLayer);
                msg->SetOldRef(lay);
                hsgResMgr::ResMgr()->SendRef(fade, msg, plRefFlags::kActiveRef);

                plGenRefMsg* toMe = new plGenRefMsg(GetKey(), plRefMsg::kOnRequest, 0, kRefFadeLay);
                hsgResMgr::ResMgr()->SendRef(fade, toMe, plRefFlags::kPassiveRef);
            }
        }
    }

    plAccessGeometry::Instance()->Close(src);

    fSetup = true;
    fFade = kImmediate;
}