235 lines
9.4 KiB
C++
235 lines
9.4 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) Carnegie Mellon University. All rights reserved.
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//
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// All use of this software is subject to the terms of the revised BSD
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// license. You should have received a copy of this license along
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// with this source code in a file named "LICENSE."
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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::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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AnimInterface(copy)
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{
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}
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////////////////////////////////////////////////////////////////////
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// Function: SequenceNode::get_num_frames
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// Access: Published, Virtual
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// Description: Returns the number of frames in the animation. This
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// is a property of the animation and may not be
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// directly adjusted by the user (although it may change
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// without warning with certain kinds of animations,
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// since this is a virtual method that may be
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// overridden).
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////////////////////////////////////////////////////////////////////
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int SequenceNode::
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get_num_frames() const {
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return get_num_children();
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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 of compatible type, adding children or
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// whatever. For instance, an LODNode should not be
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// combined with any other PandaNode, because its set of
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// children is 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::safe_to_combine_children
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// Access: Public, Virtual
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// Description: Returns true if it is generally safe to combine the
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// children of this PandaNode with each other. For
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// instance, an LODNode's children should not be
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// combined with each other, because the set of children
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// is meaningful.
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////////////////////////////////////////////////////////////////////
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bool SequenceNode::
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safe_to_combine_children() const {
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return false;
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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::cull_callback
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// Access: Public, Virtual
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// Description: This function will be called during the cull
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// traversal to perform any additional operations that
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// should be performed at cull time. This may include
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// additional manipulation of render state or additional
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// visible/invisible decisions, or any other arbitrary
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// operation.
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//
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// Note that this function will *not* be called unless
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// set_cull_callback() is called in the constructor of
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// the derived class. It is necessary to call
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// set_cull_callback() to indicated that we require
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// cull_callback() to be called.
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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_frame());
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return true;
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}
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////////////////////////////////////////////////////////////////////
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// Function: SequenceNode::get_first_visible_child
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// Access: Public, Virtual
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// Description: Returns the index number of the first visible child
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// of this node, or a number >= get_num_children() if
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// there are no visible children of this node. This is
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// called during the cull traversal, but only if
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// has_selective_visibility() has already returned true.
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// See has_selective_visibility().
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////////////////////////////////////////////////////////////////////
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int SequenceNode::
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get_first_visible_child() const {
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return get_frame();
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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: Public, Virtual
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// Description: Returns the index number of the currently visible
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// child of this node. This is only meaningful if
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// has_single_child_visibility() has returned true.
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////////////////////////////////////////////////////////////////////
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int SequenceNode::
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get_visible_child() const {
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return get_frame();
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}
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////////////////////////////////////////////////////////////////////
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// Function: SequenceNode::output
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// Access: Published, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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void SequenceNode::
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output(ostream &out) const {
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out << get_type() << " " << get_name() << ": ";
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AnimInterface::output(out);
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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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AnimInterface::write_datagram(manager, dg);
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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("");
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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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AnimInterface::fillin(scan, manager);
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}
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