firestorm/Gameleap/code/mw4/Libraries/Proxies/ChildProxy.cpp

#include "ProxyHeaders.hpp"

//
//############################################################################
//########################    ChildProxy    ###########################
//############################################################################
//

ChildProxy::ClassData*
	ChildProxy::DefaultData = NULL;

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
void
	ChildProxy::InitializeClass()
{
	Verify(!DefaultData);
	DefaultData =
		new ClassData(
			ChildProxyClassID,
			"ChildProxy",
			GenericProxy::DefaultData
		);
	Register_Object(DefaultData);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
void
	ChildProxy::TerminateClass()
{
	Unregister_Object(DefaultData);
	delete DefaultData;
	DefaultData = NULL;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
ChildProxy::ChildProxy(
	ClassData *data,
	SceneProxy *scene,
	GroupProxy *parent
):
	GenericProxy(data),
	sceneProxy(scene),
	parentProxy(parent)
{
	Check_Pointer(this);

	//
	//-----------------------------------------------------------------------
	// If we have a parent proxy, bump its reference count and add ourself to
	// its active list.  If no parent, add to the scene list
	//-----------------------------------------------------------------------
	//
	Check_Object(sceneProxy);
	if (parentProxy)
	{
		sceneProxy->AttachReference();
		Check_Object(parentProxy);
		parentProxy->AttachChildProxy(this);
	}
	else
		sceneProxy->AttachChildProxy(this);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
ChildProxy::~ChildProxy()
{
	Check_Object(this);

	//
	//-----------------------------------------------------------------------
	// If we have a parent proxy, bump its reference count and add ourself to
	// its active list.  If no parent, add to the scene list
	//-----------------------------------------------------------------------
	//
	Check_Object(sceneProxy);
	if (parentProxy)
	{
		Check_Object(parentProxy);
		parentProxy->DetachChildProxy(this);
		sceneProxy->DetachReference();
	}
	else
		sceneProxy->DetachChildProxy(this);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
void
	ChildProxy::TestInstance() const
{
	Verify(IsDerivedFrom(DefaultData));
	Check_Object(sceneProxy);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
void
	ChildProxy::GetLocalToWorld(LinearMatrix4D *matrix)
{
	Check_Object(this);
	Check_Pointer(matrix);

	//
	//------------------------------------------------------------------
	// If we don't have a parent, just return our local to parent matrix
	//------------------------------------------------------------------
	//
	GroupProxy *parent = GetParentGroupProxy();
	if (!parent)
	{
		GetLocalToParent(matrix);
		return;
	}

	//
	//------------------------------------------------------------------------
	// If we have the identity matrix, just return our parent's local to world
	//------------------------------------------------------------------------
	//
	Check_Object(parent);
	LinearMatrix4D local_to_parent;
	if (!GetLocalToParent(&local_to_parent))
	{
		parent->GetLocalToWorld(matrix);
		return;
	}

	//
	//----------------------------------
	// Concatenate and return the matrix
	//----------------------------------
	//
	LinearMatrix4D parent_to_world;
	parent->GetLocalToWorld(&parent_to_world);
	Check_Object(&parent_to_world);
	matrix->Multiply(local_to_parent, parent_to_world);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
void
	ChildProxy::TransformLocalToParent(const LinearMatrix4D &matrix)
{
	Check_Object(this);
	Check_Object(&matrix);

	//
	//---------------------------
	// Ignore identity transforms
	//---------------------------
	//
	if (matrix == LinearMatrix4D::Identity)
		return;

	//
	//--------------------------------------------------------------------
	// Get our old matrix, and if it was identity, replace it with the new
	// matrix
	//--------------------------------------------------------------------
	//
	LinearMatrix4D old;
	if (!GetLocalToParent(&old))
	{
		SetLocalToParent(matrix);
		return;
	}

	//
	//----------------------------------------------------------
	// We now have to multiply the matrices and store the result
	//----------------------------------------------------------
	//
	LinearMatrix4D transformed;
	transformed.Multiply(old, matrix);
	SetLocalToParent(transformed);
}