224 lines
8.4 KiB
C++
224 lines
8.4 KiB
C++
// Filename: lodNode.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 "lodNode.h"
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#include "cullTraverserData.h"
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#include "cullTraverser.h"
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TypeHandle LODNode::_type_handle;
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////////////////////////////////////////////////////////////////////
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// Function: LODNode::CData::make_copy
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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CycleData *LODNode::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: LODNode::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 LODNode::CData::
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write_datagram(BamWriter *manager, Datagram &dg) const {
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_lod.write_datagram(dg);
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}
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////////////////////////////////////////////////////////////////////
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// Function: LODNode::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 LODNode.
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////////////////////////////////////////////////////////////////////
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void LODNode::CData::
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fillin(DatagramIterator &scan, BamReader *manager) {
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_lod.read_datagram(scan);
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}
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////////////////////////////////////////////////////////////////////
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// Function: LODNode::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 *LODNode::
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make_copy() const {
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return new LODNode(*this);
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}
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////////////////////////////////////////////////////////////////////
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// Function: LODNode::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 LODNode::
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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: LODNode::xform
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// Access: Public, Virtual
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// Description: Transforms the contents of this PandaNode by the
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// indicated matrix, if it means anything to do so. For
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// most kinds of PandaNodes, this does nothing.
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////////////////////////////////////////////////////////////////////
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void LODNode::
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xform(const LMatrix4f &mat) {
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CDWriter cdata(_cycler);
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cdata->_lod.xform(mat);
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}
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////////////////////////////////////////////////////////////////////
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// Function: LODNode::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 LODNode::
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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: LODNode::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 LODNode::
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cull_callback(CullTraverser *trav, CullTraverserData &data) {
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if (data._net_transform->is_singular()) {
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// If we're under a singular transform, we can't compute the LOD;
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// select none of them instead.
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select_child(get_num_children());
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} else {
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CDReader cdata(_cycler);
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LPoint3f camera_pos(0, 0, 0);
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// Get the LOD center in camera space
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CPT(TransformState) rel_transform =
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trav->get_camera_transform()->invert_compose(data._net_transform);
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LPoint3f center = cdata->_lod._center * rel_transform->get_mat();
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// Determine which child to traverse
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int index = cdata->_lod.compute_child(camera_pos, center);
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select_child(index);
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}
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return true;
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}
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////////////////////////////////////////////////////////////////////
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// Function: LODNode::output
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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void LODNode::
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output(ostream &out) const {
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SelectiveChildNode::output(out);
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CDReader cdata(_cycler);
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out << " ";
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cdata->_lod.output(out);
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}
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////////////////////////////////////////////////////////////////////
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// Function: LODNode::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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// LODNode.
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////////////////////////////////////////////////////////////////////
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void LODNode::
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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: LODNode::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 LODNode::
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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: LODNode::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 LODNode is encountered
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// in the Bam file. It should create the LODNode
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// and extract its information from the file.
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////////////////////////////////////////////////////////////////////
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TypedWritable *LODNode::
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make_from_bam(const FactoryParams ¶ms) {
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LODNode *node = new LODNode("");
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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: LODNode::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 LODNode.
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////////////////////////////////////////////////////////////////////
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void LODNode::
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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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