239 lines
9.2 KiB
C++
239 lines
9.2 KiB
C++
// Filename: sequenceNode.cxx
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// Created by: drose (06Mar02)
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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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// panda3d@yahoogroups.com .
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//
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////////////////////////////////////////////////////////////////////
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#include "pandabase.h"
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#include "sequenceNode.h"
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#include "cullTraverser.h"
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TypeHandle SequenceNode::_type_handle;
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////////////////////////////////////////////////////////////////////
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// Function: SequenceNode::CData::make_copy
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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CycleData *SequenceNode::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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// Function: SequenceNode::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 SequenceNode::
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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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// Function: SequenceNode::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 SequenceNode::CData::
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write_datagram(BamWriter *manager, Datagram &dg) const {
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dg.add_float32(_cycle_rate);
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float now = ClockObject::get_global_clock()->get_frame_time();
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float frame = (now - _start_time) * _cycle_rate + _frame_offset;
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dg.add_float32(frame);
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}
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////////////////////////////////////////////////////////////////////
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// Function: SequenceNode::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 SequenceNode.
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////////////////////////////////////////////////////////////////////
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void SequenceNode::CData::
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fillin(DatagramIterator &scan, BamReader *manager) {
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_cycle_rate = scan.get_float32();
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_frame_offset = scan.get_float32();
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float now = ClockObject::get_global_clock()->get_frame_time();
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_start_time = now;
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}
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////////////////////////////////////////////////////////////////////
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// Function: SequenceNode::Copy Constructor
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// Access: Protected
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// Description:
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////////////////////////////////////////////////////////////////////
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SequenceNode::
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SequenceNode(const SequenceNode ©) :
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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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// Function: SequenceNode::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 *SequenceNode::
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make_copy() const {
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return new SequenceNode(*this);
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}
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////////////////////////////////////////////////////////////////////
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// Function: SequenceNode::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 SequenceNode::
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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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// Function: SequenceNode::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 SequenceNode::
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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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// Function: SequenceNode::has_single_child_visibility
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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 this kind of node has the special property
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// that just one of its children is visible at any given
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// time, and furthermore that the particular visible
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// child can be determined without reference to any
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// external information (such as a camera). At present,
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// only SequenceNodes and SwitchNodes fall into this
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// category.
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//
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// If this function returns true, get_visible_child()
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// can be called to return the index of the
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// currently-visible child.
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////////////////////////////////////////////////////////////////////
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bool SequenceNode::
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has_single_child_visibility() const {
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return true;
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}
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////////////////////////////////////////////////////////////////////
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// Function: SequenceNode::get_visible_child
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// Access: Published, Virtual
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// Description: Returns the index of the child that should be visible
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// for this particular frame, if there are any children.
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////////////////////////////////////////////////////////////////////
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int SequenceNode::
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get_visible_child() const {
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int num_children = get_num_children();
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if (num_children == 0) {
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return 0;
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}
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float frame = calc_frame();
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return ((int)frame) % num_children;
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}
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////////////////////////////////////////////////////////////////////
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// Function: SequenceNode::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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// SequenceNode.
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////////////////////////////////////////////////////////////////////
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void SequenceNode::
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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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// Function: SequenceNode::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 SequenceNode::
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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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// Function: SequenceNode::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 SequenceNode is encountered
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// in the Bam file. It should create the SequenceNode
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// and extract its information from the file.
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////////////////////////////////////////////////////////////////////
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TypedWritable *SequenceNode::
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make_from_bam(const FactoryParams ¶ms) {
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SequenceNode *node = new SequenceNode(0.0f, "");
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DatagramIterator scan;
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BamReader *manager;
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parse_params(params, scan, manager);
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node->fillin(scan, manager);
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return node;
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}
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////////////////////////////////////////////////////////////////////
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// Function: SequenceNode::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 SequenceNode.
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////////////////////////////////////////////////////////////////////
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void SequenceNode::
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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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