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+// Filename: switchNode.cxx
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+// Created by: drose (31Jul02)
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+//
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+////////////////////////////////////////////////////////////////////
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+//
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+// PANDA 3D SOFTWARE
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+// Copyright (c) 2001, Disney Enterprises, Inc. All rights reserved
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+//
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+// All use of this software is subject to the terms of the Panda 3d
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+// Software license. You should have received a copy of this license
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+// along with this source code; you will also find a current copy of
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+// the license at http://www.panda3d.org/license.txt .
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+//
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+// To contact the maintainers of this program write to
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+// [email protected] .
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+//
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+////////////////////////////////////////////////////////////////////
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+
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+#include "pandabase.h"
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+#include "switchNode.h"
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+#include "cullTraverser.h"
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+
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+TypeHandle SwitchNode::_type_handle;
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: SwitchNode::CData::make_copy
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+// Access: Public, Virtual
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+// Description:
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+////////////////////////////////////////////////////////////////////
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+CycleData *SwitchNode::CData::
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+make_copy() const {
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+ return new CData(*this);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: SwitchNode::safe_to_combine
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+// Access: Public, Virtual
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+// Description: Returns true if it is generally safe to combine this
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+// particular kind of PandaNode with other kinds of
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+// PandaNodes, adding children or whatever. For
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+// instance, an LODNode should not be combined with any
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+// other PandaNode, because its set of children is
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+// meaningful.
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+////////////////////////////////////////////////////////////////////
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+bool SwitchNode::
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+safe_to_combine() const {
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+ return false;
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: SwitchNode::CData::write_datagram
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+// Access: Public, Virtual
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+// Description: Writes the contents of this object to the datagram
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+// for shipping out to a Bam file.
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+////////////////////////////////////////////////////////////////////
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+void SwitchNode::CData::
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+write_datagram(BamWriter *manager, Datagram &dg) const {
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+ dg.add_int32(_visible_child);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: SwitchNode::CData::fillin
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+// Access: Public, Virtual
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+// Description: This internal function is called by make_from_bam to
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+// read in all of the relevant data from the BamFile for
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+// the new SwitchNode.
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+////////////////////////////////////////////////////////////////////
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+void SwitchNode::CData::
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+fillin(DatagramIterator &scan, BamReader *manager) {
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+ _visible_child = scan.get_int32();
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: SwitchNode::Copy Constructor
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+// Access: Protected
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+// Description:
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+////////////////////////////////////////////////////////////////////
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+SwitchNode::
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+SwitchNode(const SwitchNode ©) :
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+ SelectiveChildNode(copy),
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+ _cycler(copy._cycler)
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+{
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: SwitchNode::make_copy
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+// Access: Public, Virtual
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+// Description: Returns a newly-allocated Node that is a shallow copy
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+// of this one. It will be a different Node pointer,
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+// but its internal data may or may not be shared with
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+// that of the original Node.
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+////////////////////////////////////////////////////////////////////
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+PandaNode *SwitchNode::
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+make_copy() const {
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+ return new SwitchNode(*this);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: SwitchNode::has_cull_callback
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+// Access: Public, Virtual
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+// Description: Should be overridden by derived classes to return
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+// true if cull_callback() has been defined. Otherwise,
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+// returns false to indicate cull_callback() does not
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+// need to be called for this node during the cull
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+// traversal.
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+////////////////////////////////////////////////////////////////////
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+bool SwitchNode::
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+has_cull_callback() const {
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+ return true;
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: SwitchNode::cull_callback
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+// Access: Public, Virtual
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+// Description: If has_cull_callback() returns true, this function
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+// will be called during the cull traversal to perform
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+// any additional operations that should be performed at
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+// cull time. This may include additional manipulation
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+// of render state or additional visible/invisible
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+// decisions, or any other arbitrary operation.
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+//
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+// By the time this function is called, the node has
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+// already passed the bounding-volume test for the
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+// viewing frustum, and the node's transform and state
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+// have already been applied to the indicated
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+// CullTraverserData object.
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+//
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+// The return value is true if this node should be
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+// visible, or false if it should be culled.
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+////////////////////////////////////////////////////////////////////
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+bool SwitchNode::
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+cull_callback(CullTraverser *, CullTraverserData &) {
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+ select_child(get_visible_child());
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+ return true;
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: SwitchNode::register_with_read_factory
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+// Access: Public, Static
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+// Description: Tells the BamReader how to create objects of type
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+// SwitchNode.
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+////////////////////////////////////////////////////////////////////
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+void SwitchNode::
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+register_with_read_factory() {
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+ BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: SwitchNode::write_datagram
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+// Access: Public, Virtual
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+// Description: Writes the contents of this object to the datagram
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+// for shipping out to a Bam file.
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+////////////////////////////////////////////////////////////////////
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+void SwitchNode::
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+write_datagram(BamWriter *manager, Datagram &dg) {
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+ SelectiveChildNode::write_datagram(manager, dg);
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+ manager->write_cdata(dg, _cycler);
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: SwitchNode::make_from_bam
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+// Access: Protected, Static
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+// Description: This function is called by the BamReader's factory
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+// when a new object of type SwitchNode is encountered
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+// in the Bam file. It should create the SwitchNode
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+// and extract its information from the file.
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+////////////////////////////////////////////////////////////////////
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+TypedWritable *SwitchNode::
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+make_from_bam(const FactoryParams ¶ms) {
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+ SwitchNode *node = new SwitchNode("");
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+ DatagramIterator scan;
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+ BamReader *manager;
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+
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+ parse_params(params, scan, manager);
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+ node->fillin(scan, manager);
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+
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+ return node;
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+}
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+
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+////////////////////////////////////////////////////////////////////
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+// Function: SwitchNode::fillin
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+// Access: Protected
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+// Description: This internal function is called by make_from_bam to
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+// read in all of the relevant data from the BamFile for
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+// the new SwitchNode.
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+////////////////////////////////////////////////////////////////////
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+void SwitchNode::
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+fillin(DatagramIterator &scan, BamReader *manager) {
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+ SelectiveChildNode::fillin(scan, manager);
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+ manager->read_cdata(scan, _cycler);
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+}
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David Rose