303 lines
12 KiB
C++
Executable File
303 lines
12 KiB
C++
Executable File
// Filename: fadeLodNode.cxx
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// Created by: sshodhan (14Jun04)
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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 - 2004, 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://etc.cmu.edu/panda3d/docs/license/ .
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//
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// To contact the maintainers of this program write to
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// panda3d-general@lists.sourceforge.net .
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//
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////////////////////////////////////////////////////////////////////
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#include "fadeLodNode.h"
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#include "cullTraverserData.h"
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#include "cullTraverser.h"
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#include "clockObject.h"
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#include "colorScaleAttrib.h"
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#include "depthWriteAttrib.h"
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#include "transparencyAttrib.h"
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TypeHandle FadeLODNode::_type_handle;
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////////////////////////////////////////////////////////////////////
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// Function: FadeLODNode::CData::make_copy
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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CycleData *FadeLODNode::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: FadeLODNode::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 FadeLODNode::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: FadeLODNode::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 FadeLODNode::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: FadeLODNode::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 *FadeLODNode::
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make_copy() const {
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return new FadeLODNode(*this);
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}
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////////////////////////////////////////////////////////////////////
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// Function: FadeLODNode::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 FadeLODNode::
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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: FadeLODNode::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 FadeLODNode::
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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: FadeLODNode::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 FadeLODNode::
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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: FadeLODNode::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 FadeLODNode::
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cull_callback(CullTraverser *trav, CullTraverserData &data) {
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PandaNode *node = data.node();
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CDReader cdata(_cycler);
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if (_fade_mode) {
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float in_alpha;
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float out_alpha;
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_fade_timer -= ClockObject::get_global_clock()->get_dt();
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if (_fade_timer <= (cdata->_fade_time / 2.0)) {
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//SECOND HALF OF FADE:
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//Fade out the old LOD with z write off and
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//draw the opaque new LOD with z write on
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out_alpha = (_fade_timer*2.0) / cdata->_fade_time;
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if (out_alpha < 0.0) {
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out_alpha = 0.0;
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}
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CullTraverserData next_data_in(data, node->get_child(_fade_in));
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CullTraverserData next_data_out(data, node->get_child(_fade_out));
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// Disable Transparency on new LOD
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next_data_in._state = next_data_in._state->add_attrib(TransparencyAttrib::make(TransparencyAttrib::M_none), 0);
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// Enable Transparency on old LOD
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next_data_out._state = next_data_out._state->add_attrib(TransparencyAttrib::make(TransparencyAttrib::M_alpha), 0);
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// Start Fading the old LOD out
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next_data_out._state = next_data_out._state->add_attrib(ColorScaleAttrib::make(LVecBase4f(1.0,1.0,1.0,out_alpha)));
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// The new LOD is now opaque and has depth writing
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next_data_in._state = next_data_in._state->add_attrib(DepthWriteAttrib::make(DepthWriteAttrib::M_on), 0);
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// The old LOD is fading so it doesnt depth write
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next_data_out._state = next_data_out._state->add_attrib(DepthWriteAttrib::make(DepthWriteAttrib::M_off), 0);
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trav->traverse(next_data_in);
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trav->traverse(next_data_out);
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} else {
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// FIRST HALF OF FADE
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// Fade the new LOD in with z writing off
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// Keep drawing the old LOD opaque with z writing on
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in_alpha = (1.0 - (_fade_timer / cdata->_fade_time))*2.0;
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if (in_alpha > 1.0) {
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in_alpha = 1.0;
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}
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CullTraverserData next_data_out(data, node->get_child(_fade_out));
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CullTraverserData next_data_in(data, node->get_child(_fade_in));
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// Disable transparency on old LOD
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next_data_out._state = next_data_out._state->add_attrib(TransparencyAttrib::make(TransparencyAttrib::M_none), 0);
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// Enable transparency on new LOD
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next_data_in._state = next_data_in._state->add_attrib(TransparencyAttrib::make(TransparencyAttrib::M_alpha), 0);
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// Start Fading in the new LOD
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next_data_in._state = next_data_in._state->add_attrib(ColorScaleAttrib::make(LVecBase4f(1.0,1.0,1.0,in_alpha)));
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// Enable depth write for the old LOD
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next_data_out._state = next_data_out._state->add_attrib(DepthWriteAttrib::make(DepthWriteAttrib::M_on), 0);
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// Disable depth write for the new LOD
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next_data_in._state = next_data_in._state->add_attrib(DepthWriteAttrib::make(DepthWriteAttrib::M_off), 0);
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trav->traverse(next_data_out);
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trav->traverse(next_data_in);
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}
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if (_fade_timer < 0) { // Fading Complete
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_fade_mode = false;
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}
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} else {
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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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return false;
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} else {
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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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//printf("CHILD: %d PREVIOUS %d \n",index,_previous_child);
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if (index != _previous_child) { // Transition occurred
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_fade_mode = true;
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_fade_timer = cdata->_fade_time;
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_fade_out = _previous_child;
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_fade_in = index;
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_previous_child = index;
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CullTraverserData next_data_transition(data, node->get_child(_fade_out));
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trav->traverse(next_data_transition);
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} else {
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// No transition... handle things as usual
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// Traverse only one valid child
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CullTraverserData next_data_normal(data, node->get_child(index));
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trav->traverse(next_data_normal);
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}
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}
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}
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return false;
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}
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////////////////////////////////////////////////////////////////////
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// Function: FadeLODNode::output
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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void FadeLODNode::
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output(ostream &out) const {
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PandaNode::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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out<< "Fade Time : " << cdata->_fade_time << endl;
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}
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////////////////////////////////////////////////////////////////////
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// Function: FadeLODNode::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 FadeLODNode::
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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: FadeLODNode::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 FadeLODNode::
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write_datagram(BamWriter *manager, Datagram &dg) {
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PandaNode::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: FadeLODNode::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 *FadeLODNode::
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make_from_bam(const FactoryParams ¶ms) {
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FadeLODNode *node = new FadeLODNode("");
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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: FadeLODNode::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 FadeLODNode.
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////////////////////////////////////////////////////////////////////
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void FadeLODNode::
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fillin(DatagramIterator &scan, BamReader *manager) {
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PandaNode::fillin(scan, manager);
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manager->read_cdata(scan, _cycler);
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}
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