171 lines
4.3 KiB
C++
171 lines
4.3 KiB
C++
/**
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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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* @file jointVertexTransform.cxx
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* @author drose
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* @date 2005-03-24
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*/
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#include "jointVertexTransform.h"
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#include "datagram.h"
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#include "datagramIterator.h"
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#include "bamReader.h"
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#include "bamWriter.h"
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#include "lightMutexHolder.h"
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TypeHandle JointVertexTransform::_type_handle;
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/**
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* Constructs an invalid object; used only by the bam loader.
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*/
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JointVertexTransform::
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JointVertexTransform() :
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_matrix_stale(true)
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{
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}
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/**
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* Constructs a new object that converts vertices from the indicated joint's
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* coordinate space, into the other indicated joint's space.
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*/
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JointVertexTransform::
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JointVertexTransform(CharacterJoint *joint) :
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_joint(joint),
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_matrix_stale(true)
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{
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// Tell the joint that we need to be informed when it moves.
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_joint->_vertex_transforms.insert(this);
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mark_modified(Thread::get_current_thread());
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}
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/**
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*
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*/
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JointVertexTransform::
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~JointVertexTransform() {
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// Tell the joint to stop informing us about its motion.
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_joint->_vertex_transforms.erase(this);
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}
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/**
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* Stores the transform's matrix in the indicated object.
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*/
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void JointVertexTransform::
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get_matrix(LMatrix4 &matrix) const {
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check_matrix();
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matrix = _matrix;
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}
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/**
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* Premultiplies this transform's matrix with the indicated previous matrix,
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* so that the result is the net composition of the given transform with this
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* transform. The result is stored in the parameter "result", which should
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* not be the same matrix as previous.
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*/
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void JointVertexTransform::
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mult_matrix(LMatrix4 &result, const LMatrix4 &previous) const {
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check_matrix();
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result.multiply(_matrix, previous);
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}
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/**
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* Adds the value of this transform's matrix, modified by the indicated
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* weight, into the indicated accumulation matrix. This is used to compute
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* the result of several blended transforms.
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*/
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void JointVertexTransform::
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accumulate_matrix(LMatrix4 &accum, PN_stdfloat weight) const {
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check_matrix();
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accum.accumulate(_matrix, weight);
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}
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/**
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*
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*/
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void JointVertexTransform::
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output(ostream &out) const {
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out << _joint->get_name();
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}
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/**
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* Recomputes _matrix if it needs it. Uses locking.
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*/
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void JointVertexTransform::
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compute_matrix() {
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LightMutexHolder holder(_lock);
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if (_matrix_stale) {
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_matrix = _joint->_initial_net_transform_inverse * _joint->_net_transform;
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_matrix_stale = false;
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}
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}
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/**
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* Tells the BamReader how to create objects of type JointVertexTransform.
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*/
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void JointVertexTransform::
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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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* Writes the contents of this object to the datagram for shipping out to a
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* Bam file.
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*/
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void JointVertexTransform::
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write_datagram(BamWriter *manager, Datagram &dg) {
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VertexTransform::write_datagram(manager, dg);
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manager->write_pointer(dg, _joint);
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}
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/**
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* Receives an array of pointers, one for each time manager->read_pointer()
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* was called in fillin(). Returns the number of pointers processed.
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*/
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int JointVertexTransform::
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complete_pointers(TypedWritable **p_list, BamReader *manager) {
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int pi = VertexTransform::complete_pointers(p_list, manager);
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_joint = DCAST(CharacterJoint, p_list[pi++]);
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_joint->_vertex_transforms.insert(this);
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return pi;
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}
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/**
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* This function is called by the BamReader's factory when a new object of
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* type JointVertexTransform is encountered in the Bam file. It should create
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* the JointVertexTransform and extract its information from the file.
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*/
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TypedWritable *JointVertexTransform::
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make_from_bam(const FactoryParams ¶ms) {
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JointVertexTransform *object = new JointVertexTransform;
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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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object->fillin(scan, manager);
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return object;
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}
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/**
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* This internal function is called by make_from_bam to read in all of the
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* relevant data from the BamFile for the new JointVertexTransform.
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*/
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void JointVertexTransform::
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fillin(DatagramIterator &scan, BamReader *manager) {
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VertexTransform::fillin(scan, manager);
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manager->read_pointer(scan);
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_matrix_stale = true;
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mark_modified(Thread::get_current_thread());
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}
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