155 lines
5.4 KiB
C++
155 lines
5.4 KiB
C++
// Filename: light.cxx
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// Created by: mike (09Jan97)
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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 "light.h"
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#include "bamWriter.h"
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#include "bamReader.h"
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#include "datagram.h"
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#include "datagramIterator.h"
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UpdateSeq Light::_sort_seq;
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TypeHandle Light::_type_handle;
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////////////////////////////////////////////////////////////////////
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// Function: Light::CData::make_copy
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// Access: Public, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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CycleData *Light::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: Light::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 Light::CData::
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write_datagram(BamWriter *, Datagram &dg) const {
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_color.write_datagram(dg);
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}
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////////////////////////////////////////////////////////////////////
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// Function: Light::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 Light.
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////////////////////////////////////////////////////////////////////
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void Light::CData::
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fillin(DatagramIterator &scan, BamReader *) {
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_color.read_datagram(scan);
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}
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////////////////////////////////////////////////////////////////////
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// Function: Light::Destructor
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// Access: Published, Virtual
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// Description:
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////////////////////////////////////////////////////////////////////
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Light::
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~Light() {
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}
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////////////////////////////////////////////////////////////////////
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// Function: Light::is_ambient_light
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// Access: Published, Virtual
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// Description: Returns true if this is an AmbientLight, false if it
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// is some other kind of light.
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////////////////////////////////////////////////////////////////////
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bool Light::
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is_ambient_light() const {
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return false;
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}
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////////////////////////////////////////////////////////////////////
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// Function: Light::get_vector_to_light
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// Access: Public, Virtual
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// Description: Computes the vector from a particular vertex to this
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// light. The exact vector depends on the type of light
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// (e.g. point lights return a different result than
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// directional lights).
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//
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// The input parameters are the vertex position in
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// question, expressed in object space, and the matrix
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// which converts from light space to object space. The
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// result is expressed in object space.
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//
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// The return value is true if the result is successful,
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// or false if it cannot be computed (e.g. for an
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// ambient light).
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////////////////////////////////////////////////////////////////////
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bool Light::
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get_vector_to_light(LVector3 &, const LPoint3 &, const LMatrix4 &) {
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return false;
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}
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////////////////////////////////////////////////////////////////////
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// Function: Light::get_viz
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// Access: Public
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// Description: Returns a GeomNode that may be rendered to visualize
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// the Light. This is used during the cull traversal to
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// render the Lights that have been made visible.
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////////////////////////////////////////////////////////////////////
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GeomNode *Light::
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get_viz() {
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CDLockedReader cdata(_cycler);
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if (cdata->_viz_geom_stale) {
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CDWriter cdata_w(_cycler, cdata);
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cdata_w->_viz_geom = new GeomNode("viz");
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fill_viz_geom(cdata_w->_viz_geom);
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cdata_w->_viz_geom_stale = false;
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}
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return cdata->_viz_geom;
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}
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////////////////////////////////////////////////////////////////////
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// Function: Light::fill_viz_geom
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// Access: Protected, Virtual
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// Description: Fills the indicated GeomNode up with Geoms suitable
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// for rendering this light.
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////////////////////////////////////////////////////////////////////
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void Light::
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fill_viz_geom(GeomNode *) {
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}
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////////////////////////////////////////////////////////////////////
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// Function: Light::write_datagram
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// Access: Protected
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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 Light::
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write_datagram(BamWriter *manager, Datagram &dg) {
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manager->write_cdata(dg, _cycler);
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dg.add_int32(_priority);
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}
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////////////////////////////////////////////////////////////////////
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// Function: Light::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 Light.
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////////////////////////////////////////////////////////////////////
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void Light::
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fillin(DatagramIterator &scan, BamReader *manager) {
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manager->read_cdata(scan, _cycler);
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_priority = scan.get_int32();
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}
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