CWE-ou-minkata/Sources/Plasma/PubUtilLib/plGLight/plShadowCaster.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 "plShadowCaster.h"
#include "plMessage/plShadowCastMsg.h"

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

#include "plDrawable/plDrawableSpans.h"
#include "plDrawable/plSpanTypes.h"

#include "plSurface/hsGMaterial.h"
#include "plSurface/plLayerInterface.h"

#include "plMessage/plRenderMsg.h"

#include "plgDispatch.h"

#include "plShadowMaster.h"

hsBool plShadowCaster::fShadowCastDisabled = false;
hsBool plShadowCaster::fCanShadowCast = true;

plShadowCaster::plShadowCaster()
:   fMaxOpacity(0),
    fCastFlags(0),
    fAttenScale(1.f),
    fBlurScale(0.f),
    fBoost(1.f)
{
}

plShadowCaster::~plShadowCaster()
{
    Deactivate();
}

void plShadowCaster::Read(hsStream* stream, hsResMgr* mgr)
{
    plMultiModifier::Read(stream, mgr);

    fCastFlags = stream->ReadByte();

    // HACKTESTPERSP
//  if( !(fCastFlags & kPerspective) )
//      fCastFlags |= kPerspective;
//  else
        fCastFlags &= ~kPerspective;

    fBoost = stream->ReadSwapScalar();
    fAttenScale = stream->ReadSwapScalar();
    fBlurScale = stream->ReadSwapScalar();

    Activate();
}

void plShadowCaster::Write(hsStream* stream, hsResMgr* mgr)
{
    plMultiModifier::Write(stream, mgr);

    stream->WriteByte(fCastFlags);

    stream->WriteSwapScalar(fBoost);
    stream->WriteSwapScalar(fAttenScale);
    stream->WriteSwapScalar(fBlurScale);
}

void plShadowCaster::Activate() const
{
    plgDispatch::Dispatch()->RegisterForExactType(plRenderMsg::Index(), GetKey());
}

void plShadowCaster::Deactivate() const
{
    plgDispatch::Dispatch()->UnRegisterForExactType(plRenderMsg::Index(), GetKey());
}

void plShadowCaster::ICollectAllSpans()
{
    fSpans.SetCount(0);
    int i;
    for( i = 0; i < GetNumTargets(); i++ )
    {
        plSceneObject* so = GetTarget(i);
        // Nil target? Shouldn't happen.
        if( so )
        {
            const plDrawInterface* di = so->GetDrawInterface();
            // Nil di- either it hasn't loaded yet, or we've been applied to something that isn't visible (oops).
            if( di && !di->GetProperty(plDrawInterface::kDisable) )
            {
                int j;
                for( j = 0; j < di->GetNumDrawables(); j++ )
                {
                    plDrawableSpans* dr = plDrawableSpans::ConvertNoRef(di->GetDrawable(j));
                    // Nil dr - it hasn't loaded yet.
                    if( dr )
                    {
                        plDISpanIndex& diIndex = dr->GetDISpans(di->GetDrawableMeshIndex(j));
                        if( !diIndex.IsMatrixOnly() )
                        {
                            int k;
                            for( k = 0; k < diIndex.GetCount(); k++ )
                            {
                                const plSpan* span = dr->GetSpan(diIndex[k]);
//                              if( !(span->fProps & plSpan::kPropNoShadowCast) )
                                {
                                    fSpans.Append(DrawSpan().Set(dr, span, diIndex[k]));
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}

hsBool plShadowCaster::IOnRenderMsg(plRenderMsg* msg)
{
    if( ShadowCastDisabled() )
        return true;

    const UInt8 shadowQuality = UInt8(plShadowMaster::GetGlobalShadowQuality() * 3.9f);
    if( !GetKey()->GetUoid().GetLoadMask().MatchesQuality(shadowQuality) )
        return true;

    // Don't really like having to gather these guys up every frame,
    // but with the avatar customization, it's all pretty volatile,
    // subject to infrequent change, but change without warning.
    // The number of actual targets (and hence shadow casting spans)
    // for any ShadowCasterModifier should always be on the order of
    // 10, so chances are we can get away with this. If not, we can
    // figure some way of caching, like a broadcast message warning us
    // that an avatar customization event has occurred.
    ICollectAllSpans();

    // Max opacity used to fade out shadows during link

    //find max opacity of all spans
    //clear shadowBits of all spans
    fMaxOpacity = 0.f;
    int i;
    for( i = 0; i < fSpans.GetCount(); i++ )
    {
        hsGMaterial* mat = fSpans[i].fDraw->GetSubMaterial(fSpans[i].fSpan->fMaterialIdx);
        if( mat )
        {
            plLayerInterface* baseLay = mat->GetLayer(0);
            if( baseLay && (baseLay->GetOpacity() > fMaxOpacity) )
                fMaxOpacity = baseLay->GetOpacity();
        }

        fSpans[i].fSpan->ClearShadowBits();
    }


    if( fMaxOpacity > 0 )
    {
        plShadowCastMsg* cast = TRACKED_NEW plShadowCastMsg(GetKey(), this, msg->Pipeline());
        cast->Send();
    }

    return true;
}


#include "plProfile.h"
plProfile_CreateTimer("ShadowCaster", "RenderSetup", ShadowCaster);

hsBool plShadowCaster::MsgReceive(plMessage* msg)
{
    plRenderMsg* rendMsg = plRenderMsg::ConvertNoRef(msg);
    if( rendMsg )
    {
        plProfile_BeginLap(ShadowCaster, this->GetKey()->GetUoid().GetObjectName());
        IOnRenderMsg(rendMsg);
        plProfile_EndLap(ShadowCaster, this->GetKey()->GetUoid().GetObjectName());
        return true;
    }

    return plMultiModifier::MsgReceive(msg);
}