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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 "Wm5BspNode.h"
#include "Wm5Camera.h"
using namespace Wm5;
WM5_IMPLEMENT_RTTI(Wm5, Node, BspNode);
WM5_IMPLEMENT_STREAM(BspNode);
WM5_IMPLEMENT_FACTORY(BspNode);
WM5_IMPLEMENT_DEFAULT_NAMES(Node, BspNode);
//----------------------------------------------------------------------------
BspNode::BspNode ()
:
ModelPlane(0.0f, 0.0f, 0.0f, 0.0f),
mWorldPlane(0.0f, 0.0f, 0.0f, 0.0f)
{
mChild.push_back(0); // left child
mChild.push_back(0); // middle child
mChild.push_back(0); // right child
}
//----------------------------------------------------------------------------
BspNode::BspNode (const HPlane& modelPlane)
:
ModelPlane(modelPlane),
mWorldPlane(modelPlane)
{
mChild.push_back(0); // left child
mChild.push_back(0); // middle child
mChild.push_back(0); // right child
}
//----------------------------------------------------------------------------
BspNode::~BspNode ()
{
}
//----------------------------------------------------------------------------
Spatial* BspNode::GetContainingNode (const APoint& point)
{
SpatialPtr posChild = GetPositiveChild();
SpatialPtr negChild = GetNegativeChild();
if (posChild || negChild)
{
BspNode* bspChild;
if (mWorldPlane.WhichSide(point) < 0)
{
bspChild = DynamicCast<BspNode>(negChild);
if (bspChild)
{
return bspChild->GetContainingNode(point);
}
else
{
return negChild;
}
}
else
{
bspChild = DynamicCast<BspNode>(posChild);
if (bspChild)
{
return bspChild->GetContainingNode(point);
}
else
{
return posChild;
}
}
}
return this;
}
//----------------------------------------------------------------------------
void BspNode::UpdateWorldData (double applicationTime)
{
Node::UpdateWorldData(applicationTime);
mWorldPlane = ModelPlane*WorldTransform.Inverse();
mWorldPlane.Normalize();
}
//----------------------------------------------------------------------------
void BspNode::GetVisibleSet (Culler& culler, bool noCull)
{
// Get visible Geometry in back-to-front order. If a global effect is
// active, the Geometry objects in the subtree will be drawn using it.
SpatialPtr posChild = GetPositiveChild();
SpatialPtr copChild = GetCoplanarChild();
SpatialPtr negChild = GetNegativeChild();
const Camera* camera = culler.GetCamera();
int positionSide = mWorldPlane.WhichSide(camera->GetPosition());
int frustumSide = culler.WhichSide(mWorldPlane);
if (positionSide > 0)
{
// Camera origin on positive side of plane.
if (frustumSide <= 0)
{
// The frustum is on the negative side of the plane or straddles
// the plane. In either case, the negative child is potentially
// visible.
if (negChild)
{
negChild->OnGetVisibleSet(culler, noCull);
}
}
if (frustumSide == 0)
{
// The frustum straddles the plane. The coplanar child is
// potentially visible.
if (copChild)
{
copChild->OnGetVisibleSet(culler, noCull);
}
}
if (frustumSide >= 0)
{
// The frustum is on the positive side of the plane or straddles
// the plane. In either case, the positive child is potentially
// visible.
if (posChild)
{
posChild->OnGetVisibleSet(culler, noCull);
}
}
}
else if (positionSide < 0)
{
// Camera origin on negative side of plane.
if (frustumSide >= 0)
{
// The frustum is on the positive side of the plane or straddles
// the plane. In either case, the positive child is potentially
// visible.
if (posChild)
{
posChild->OnGetVisibleSet(culler, noCull);
}
}
if (frustumSide == 0)
{
// The frustum straddles the plane. The coplanar child is
// potentially visible.
if (copChild)
{
copChild->OnGetVisibleSet(culler, noCull);
}
}
if (frustumSide <= 0)
{
// The frustum is on the negative side of the plane or straddles
// the plane. In either case, the negative child is potentially
// visible.
if (negChild)
{
negChild->OnGetVisibleSet(culler, noCull);
}
}
}
else
{
// Camera origin on plane itself. Both sides of the plane are
// potentially visible as well as the plane itself. Select the
// first-to-be-drawn half space to be the one to which the camera
// direction points.
float NdD = mWorldPlane.GetNormal().Dot(camera->GetDVector());
if (NdD >= 0.0f)
{
if (posChild)
{
posChild->OnGetVisibleSet(culler, noCull);
}
if (copChild)
{
copChild->OnGetVisibleSet(culler, noCull);
}
if (negChild)
{
negChild->OnGetVisibleSet(culler, noCull);
}
}
else
{
if (negChild)
{
negChild->OnGetVisibleSet(culler, noCull);
}
if (copChild)
{
copChild->OnGetVisibleSet(culler, noCull);
}
if (posChild)
{
posChild->OnGetVisibleSet(culler, noCull);
}
}
}
}
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
// Streaming support.
//----------------------------------------------------------------------------
BspNode::BspNode (LoadConstructor value)
:
Node(value),
ModelPlane(0.0f, 0.0f, 0.0f, 0.0f),
mWorldPlane(0.0f, 0.0f, 0.0f, 0.0f)
{
}
//----------------------------------------------------------------------------
void BspNode::Load (InStream& source)
{
WM5_BEGIN_DEBUG_STREAM_LOAD(source);
Node::Load(source);
source.ReadAggregate(ModelPlane);
source.ReadAggregate(mWorldPlane);
WM5_END_DEBUG_STREAM_LOAD(BspNode, source);
}
//----------------------------------------------------------------------------
void BspNode::Link (InStream& source)
{
Node::Link(source);
}
//----------------------------------------------------------------------------
void BspNode::PostLink ()
{
Node::PostLink();
}
//----------------------------------------------------------------------------
bool BspNode::Register (OutStream& target) const
{
return Node::Register(target);
}
//----------------------------------------------------------------------------
void BspNode::Save (OutStream& target) const
{
WM5_BEGIN_DEBUG_STREAM_SAVE(target);
Node::Save(target);
target.Write(ModelPlane);
target.Write(mWorldPlane);
WM5_END_DEBUG_STREAM_SAVE(BspNode, target);
}
//----------------------------------------------------------------------------
int BspNode::GetStreamingSize () const
{
int size = Node::GetStreamingSize();
size += sizeof(ModelPlane);
size += sizeof(mWorldPlane);
return size;
}
//----------------------------------------------------------------------------
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