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// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.0 (2010/01/01)
#include "Wm5GraphicsPCH.h"
#include "Wm5DlodNode.h"
#include "Wm5Camera.h"
using namespace Wm5;
WM5_IMPLEMENT_RTTI(Wm5, SwitchNode, DlodNode);
WM5_IMPLEMENT_STREAM(DlodNode);
WM5_IMPLEMENT_FACTORY(DlodNode);
WM5_IMPLEMENT_DEFAULT_NAMES(SwitchNode, DlodNode);
//----------------------------------------------------------------------------
DlodNode::DlodNode (int numLevelsOfDetail)
:
mNumLevelsOfDetail(numLevelsOfDetail)
{
mModelMinDist = new1<float>(mNumLevelsOfDetail);
mModelMaxDist = new1<float>(mNumLevelsOfDetail);
mWorldMinDist = new1<float>(mNumLevelsOfDetail);
mWorldMaxDist = new1<float>(mNumLevelsOfDetail);
}
//----------------------------------------------------------------------------
DlodNode::~DlodNode ()
{
delete1(mModelMinDist);
delete1(mModelMaxDist);
delete1(mWorldMinDist);
delete1(mWorldMaxDist);
}
//----------------------------------------------------------------------------
void DlodNode::SetModelDistance (int i, float minDist, float maxDist)
{
if (0 <= i && i < mNumLevelsOfDetail)
{
mModelMinDist[i] = minDist;
mModelMaxDist[i] = maxDist;
mWorldMinDist[i] = minDist;
mWorldMaxDist[i] = maxDist;
return;
}
assertion(false, "Invalid index in SetModelDistance.\n");
}
//----------------------------------------------------------------------------
void DlodNode::SelectLevelOfDetail (const Camera* camera)
{
// ASSERT: The child array of an DlodNode is compacted--there are no
// empty slots in the array and the number of children is mChild.size().
// Moreover, it is assumed that all model distance values were set for
// these children.
// Compute the world LOD center.
mWorldLodCenter = WorldTransform*mModelLodCenter;
// Compute the world squared-distance intervals.
int i;
for (i = 0; i < mNumLevelsOfDetail; ++i)
{
mWorldMinDist[i] = WorldTransform.GetUniformScale()*mModelMinDist[i];
mWorldMaxDist[i] = WorldTransform.GetUniformScale()*mModelMaxDist[i];
}
// Select the LOD child.
SetActiveChild(SN_INVALID_CHILD);
AVector diff = mWorldLodCenter - camera->GetPosition();
float dist = diff.Length();
for (i = 0; i < mNumLevelsOfDetail; ++i)
{
if (mWorldMinDist[i] <= dist && dist < mWorldMaxDist[i])
{
SetActiveChild(i);
break;
}
}
}
//----------------------------------------------------------------------------
void DlodNode::GetVisibleSet (Culler& culler, bool noCull)
{
SelectLevelOfDetail(culler.GetCamera());
SwitchNode::GetVisibleSet(culler, noCull);
}
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
// Streaming support.
//----------------------------------------------------------------------------
DlodNode::DlodNode (LoadConstructor value)
:
SwitchNode(value),
mNumLevelsOfDetail(0),
mModelMinDist(0),
mModelMaxDist(0),
mWorldMinDist(0),
mWorldMaxDist(0)
{
}
//----------------------------------------------------------------------------
void DlodNode::Load (InStream& source)
{
WM5_BEGIN_DEBUG_STREAM_LOAD(source);
SwitchNode::Load(source);
source.ReadAggregate(mModelLodCenter);
source.ReadRR(mNumLevelsOfDetail, mModelMinDist);
source.ReadVR(mNumLevelsOfDetail, mModelMaxDist);
source.ReadVR(mNumLevelsOfDetail, mWorldMinDist);
source.ReadVR(mNumLevelsOfDetail, mWorldMaxDist);
WM5_END_DEBUG_STREAM_LOAD(DlodNode, source);
}
//----------------------------------------------------------------------------
void DlodNode::Link (InStream& source)
{
SwitchNode::Link(source);
}
//----------------------------------------------------------------------------
void DlodNode::PostLink ()
{
SwitchNode::PostLink();
}
//----------------------------------------------------------------------------
bool DlodNode::Register (OutStream& target) const
{
return SwitchNode::Register(target);
}
//----------------------------------------------------------------------------
void DlodNode::Save (OutStream& target) const
{
WM5_BEGIN_DEBUG_STREAM_SAVE(target);
SwitchNode::Save(target);
target.WriteAggregate(mModelLodCenter);
target.WriteW(mNumLevelsOfDetail, mModelMinDist);
target.WriteN(mNumLevelsOfDetail, mModelMaxDist);
target.WriteN(mNumLevelsOfDetail, mWorldMinDist);
target.WriteN(mNumLevelsOfDetail, mWorldMaxDist);
// The world LOD center is computed from the model LOD center in
// SelectLevelOfDetail. The world distance extremes are also computed
// from the model distance extremes in SelectLevelOfDetail. These
// world quantities do not need to be saved.
WM5_END_DEBUG_STREAM_SAVE(DlodNode, target);
}
//----------------------------------------------------------------------------
int DlodNode::GetStreamingSize () const
{
int size = SwitchNode::GetStreamingSize();
size += sizeof(mModelLodCenter);
size += sizeof(mNumLevelsOfDetail);
size += mNumLevelsOfDetail*sizeof(float);
size += mNumLevelsOfDetail*sizeof(float);
size += mNumLevelsOfDetail*sizeof(float);
size +=mNumLevelsOfDetail*sizeof(float);
return size;
}
//----------------------------------------------------------------------------
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