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pointLight.cxx
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1/**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file pointLight.cxx
10 * @author mike
11 * @date 1997-01-09
12 */
13
14#include "pointLight.h"
15#include "graphicsStateGuardianBase.h"
16#include "bamWriter.h"
17#include "bamReader.h"
18#include "datagram.h"
19#include "datagramIterator.h"
20#include "config_pgraphnodes.h"
21
22 TypeHandle PointLight::_type_handle;
23
24/**
25 *
26 */
27 CycleData *PointLight::CData::
28make_copy() const {
29 return new CData(*this);
30}
31
32/**
33 * Writes the contents of this object to the datagram for shipping out to a
34 * Bam file.
35 */
36 void PointLight::CData::
37write_datagram(BamWriter *manager, Datagram &dg) const {
38 _specular_color.write_datagram(dg);
39 _attenuation.write_datagram(dg);
40 if (manager->get_file_minor_ver() >= 41) {
41 dg.add_stdfloat(_max_distance);
42 }
43 _point.write_datagram(dg);
44}
45
46/**
47 * This internal function is called by make_from_bam to read in all of the
48 * relevant data from the BamFile for the new Light.
49 */
50 void PointLight::CData::
51fillin(DatagramIterator &scan, BamReader *manager) {
52 _specular_color.read_datagram(scan);
53 _attenuation.read_datagram(scan);
54 if (manager->get_file_minor_ver() >= 41) {
55 _max_distance = scan.get_stdfloat();
56 }
57 _point.read_datagram(scan);
58}
59
60/**
61 *
62 */
63PointLight::
64PointLight(const std::string &name) :
65 LightLensNode(name) {
66 PT(Lens) lens;
67 lens = new PerspectiveLens(90, 90);
68 lens->set_interocular_distance(0);
69 lens->set_view_vector(1, 0, 0, 0, -1, 0);
70 set_lens(0, lens);
71 lens = new PerspectiveLens(90, 90);
72 lens->set_interocular_distance(0);
73 lens->set_view_vector(-1, 0, 0, 0, -1, 0);
74 set_lens(1, lens);
75 lens = new PerspectiveLens(90, 90);
76 lens->set_interocular_distance(0);
77 lens->set_view_vector(0, 1, 0, 0, 0, 1);
78 set_lens(2, lens);
79 lens = new PerspectiveLens(90, 90);
80 lens->set_interocular_distance(0);
81 lens->set_view_vector(0, -1, 0, 0, 0, -1);
82 set_lens(3, lens);
83 lens = new PerspectiveLens(90, 90);
84 lens->set_interocular_distance(0);
85 lens->set_view_vector(0, 0, 1, 0, -1, 0);
86 set_lens(4, lens);
87 lens = new PerspectiveLens(90, 90);
88 lens->set_interocular_distance(0);
89 lens->set_view_vector(0, 0, -1, 0, -1, 0);
90 set_lens(5, lens);
91}
92
93/**
94 * Do not call the copy constructor directly; instead, use make_copy() or
95 * copy_subgraph() to make a copy of a node.
96 */
97PointLight::
98PointLight(const PointLight &copy) :
99 LightLensNode(copy),
100 _cycler(copy._cycler)
101{
102}
103
104/**
105 * Returns a newly-allocated PandaNode that is a shallow copy of this one. It
106 * will be a different pointer, but its internal data may or may not be shared
107 * with that of the original PandaNode. No children will be copied.
108 */
109 PandaNode *PointLight::
110 make_copy() const {
111 return new PointLight(*this);
112}
113
114/**
115 * Transforms the contents of this PandaNode by the indicated matrix, if it
116 * means anything to do so. For most kinds of PandaNodes, this does nothing.
117 */
118 void PointLight::
119 xform(const LMatrix4 &mat) {
120 LightLensNode::xform(mat);
121 CDWriter cdata(_cycler);
122 cdata->_point = cdata->_point * mat;
123 mark_viz_stale();
124}
125
126/**
127 *
128 */
129 void PointLight::
130write(std::ostream &out, int indent_level) const {
131 indent(out, indent_level) << *this << ":\n";
132 indent(out, indent_level + 2)
133 << "color " << get_color() << "\n";
134 if (_has_specular_color) {
135 indent(out, indent_level + 2)
136 << "specular color " << get_specular_color() << "\n";
137 }
138 indent(out, indent_level + 2)
139 << "attenuation " << get_attenuation() << "\n";
140
141 if (!cinf(get_max_distance())) {
142 indent(out, indent_level + 2)
143 << "max distance " << get_max_distance() << "\n";
144 }
145}
146
147/**
148 * Computes the vector from a particular vertex to this light. The exact
149 * vector depends on the type of light (e.g. point lights return a different
150 * result than directional lights).
151 *
152 * The input parameters are the vertex position in question, expressed in
153 * object space, and the matrix which converts from light space to object
154 * space. The result is expressed in object space.
155 *
156 * The return value is true if the result is successful, or false if it cannot
157 * be computed (e.g. for an ambient light).
158 */
159 bool PointLight::
160 get_vector_to_light(LVector3 &result, const LPoint3 &from_object_point,
161 const LMatrix4 &to_object_space) {
162 CDReader cdata(_cycler);
163 LPoint3 point = cdata->_point * to_object_space;
164
165 result = point - from_object_point;
166 return true;
167}
168
169/**
170 * Returns the relative priority associated with all lights of this class.
171 * This priority is used to order lights whose instance priority
172 * (get_priority()) is the same--the idea is that other things being equal,
173 * AmbientLights (for instance) are less important than DirectionalLights.
174 */
175 int PointLight::
176 get_class_priority() const {
177 return (int)CP_point_priority;
178}
179
180/**
181 *
182 */
183 void PointLight::
184bind(GraphicsStateGuardianBase *gsg, const NodePath &light, int light_id) {
185 gsg->bind_light(this, light, light_id);
186}
187
188/**
189 * Creates the shadow map texture. Can be overridden.
190 */
191 void PointLight::
192setup_shadow_map() {
193 if (_shadow_map != nullptr && _shadow_map->get_x_size() == _sb_size[0]) {
194 // Nothing to do.
195 return;
196 }
197
198 if (_sb_size[0] != _sb_size[1]) {
199 pgraphnodes_cat.error()
200 << "PointLight shadow buffers must have an equal width and height!\n";
201 }
202
203 if (_shadow_map == nullptr) {
204 _shadow_map = new Texture(get_name());
205 }
206
207 _shadow_map->setup_cube_map(_sb_size[0], Texture::T_unsigned_byte, Texture::F_depth_component);
208 _shadow_map->set_clear_color(LColor(1));
209 _shadow_map->set_wrap_u(SamplerState::WM_clamp);
210 _shadow_map->set_wrap_v(SamplerState::WM_clamp);
211
212 // Note: cube map shadow filtering doesn't seem to work in Cg.
213 _shadow_map->set_minfilter(SamplerState::FT_linear);
214 _shadow_map->set_magfilter(SamplerState::FT_linear);
215}
216
217/**
218 * Tells the BamReader how to create objects of type PointLight.
219 */
220 void PointLight::
221 register_with_read_factory() {
222 BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
223}
224
225/**
226 * Writes the contents of this object to the datagram for shipping out to a
227 * Bam file.
228 */
229 void PointLight::
230 write_datagram(BamWriter *manager, Datagram &dg) {
231 LightLensNode::write_datagram(manager, dg);
232 if (manager->get_file_minor_ver() >= 39) {
233 dg.add_bool(_has_specular_color);
234 }
235 manager->write_cdata(dg, _cycler);
236}
237
238/**
239 * This function is called by the BamReader's factory when a new object of
240 * type PointLight is encountered in the Bam file. It should create the
241 * PointLight and extract its information from the file.
242 */
243 TypedWritable *PointLight::
244make_from_bam(const FactoryParams &params) {
245 PointLight *node = new PointLight("");
246 DatagramIterator scan;
247 BamReader *manager;
248
249 parse_params(params, scan, manager);
250 node->fillin(scan, manager);
251
252 return node;
253}
254
255/**
256 * This internal function is called by make_from_bam to read in all of the
257 * relevant data from the BamFile for the new PointLight.
258 */
259 void PointLight::
260fillin(DatagramIterator &scan, BamReader *manager) {
261 LightLensNode::fillin(scan, manager);
262
263 if (manager->get_file_minor_ver() >= 39) {
264 _has_specular_color = scan.get_bool();
265 } else {
266 _has_specular_color = true;
267 }
268
269 manager->read_cdata(scan, _cycler);
270}
bamReader.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
parse_params
void parse_params(const FactoryParams &params, DatagramIterator &scan, BamReader *&manager)
Takes in a FactoryParams, passed from a WritableFactory into any TypedWritable's make function,...
Definition bamReader.I:275
bamWriter.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
BamReader
This is the fundamental interface for extracting binary objects from a Bam file, as generated by a Ba...
Definition bamReader.h:110
BamReader::get_file_minor_ver
int get_file_minor_ver() const
Returns the minor version number of the Bam file currently being read.
Definition bamReader.I:83
BamReader::read_cdata
void read_cdata(DatagramIterator &scan, PipelineCyclerBase &cycler)
Reads in the indicated CycleData object.
Definition bamReader.cxx:695
BamReader::get_factory
static WritableFactory * get_factory()
Returns the global WritableFactory for generating TypedWritable objects.
Definition bamReader.I:177
BamWriter
This is the fundamental interface for writing binary objects to a Bam file, to be extracted later by ...
Definition bamWriter.h:63
BamWriter::write_cdata
void write_cdata(Datagram &packet, const PipelineCyclerBase &cycler)
Writes out the indicated CycleData object.
Definition bamWriter.cxx:425
BamWriter::get_file_minor_ver
int get_file_minor_ver() const
Returns the minor version number of the Bam file currently being written.
Definition bamWriter.I:59
CycleData
A single page of data maintained by a PipelineCycler.
Definition cycleData.h:50
DatagramIterator
A class to retrieve the individual data elements previously stored in a Datagram.
Definition datagramIterator.h:30
DatagramIterator::get_stdfloat
PN_stdfloat get_stdfloat()
Extracts either a 32-bit or a 64-bit floating-point number, according to Datagram::set_stdfloat_doubl...
Definition datagramIterator.I:242
DatagramIterator::get_bool
bool get_bool()
Extracts a boolean value.
Definition datagramIterator.I:48
Datagram
An ordered list of data elements, formatted in memory for transmission over a socket or writing to a ...
Definition datagram.h:38
Datagram::add_stdfloat
void add_stdfloat(PN_stdfloat value)
Adds either a 32-bit or a 64-bit floating-point number, according to set_stdfloat_double().
Definition datagram.I:133
Datagram::add_bool
void add_bool(bool value)
Adds a boolean value to the datagram.
Definition datagram.I:34
FactoryParams
An instance of this class is passed to the Factory when requesting it to do its business and construc...
Definition factoryParams.h:36
Factory::register_factory
void register_factory(TypeHandle handle, CreateFunc *func, void *user_data=nullptr)
Registers a new kind of thing the Factory will be able to create.
Definition factory.I:73
GraphicsStateGuardianBase
This is a base class for the GraphicsStateGuardian class, which is itself a base class for the variou...
Definition graphicsStateGuardianBase.h:110
LensNode::xform
virtual void xform(const LMatrix4 &mat)
Transforms the contents of this PandaNode by the indicated matrix, if it means anything to do so.
Definition lensNode.cxx:53
Lens
A base class for any number of different kinds of lenses, linear and otherwise.
Definition lens.h:41
LightLensNode
A derivative of Light and of Camera.
Definition lightLensNode.h:33
LightLensNode::write_datagram
virtual void write_datagram(BamWriter *manager, Datagram &dg)
Writes the contents of this object to the datagram for shipping out to a Bam file.
Definition lightLensNode.cxx:234
Light::get_color
get_color
Returns the basic color of the light.
Definition light.h:49
NodePath
NodePath is the fundamental system for disambiguating instances, and also provides a higher-level int...
Definition nodePath.h:159
PandaNode
A basic node of the scene graph or data graph.
Definition pandaNode.h:65
PerspectiveLens
A perspective-type lens: a normal camera.
Definition perspectiveLens.h:25
PointLight
A light originating from a single point in space, and shining in all directions.
Definition pointLight.h:25
PointLight::xform
virtual void xform(const LMatrix4 &mat)
Transforms the contents of this PandaNode by the indicated matrix, if it means anything to do so.
Definition pointLight.cxx:119
PointLight::get_vector_to_light
virtual bool get_vector_to_light(LVector3 &result, const LPoint3 &from_object_point, const LMatrix4 &to_object_space)
Computes the vector from a particular vertex to this light.
Definition pointLight.cxx:160
PointLight::get_class_priority
virtual int get_class_priority() const
Returns the relative priority associated with all lights of this class.
Definition pointLight.cxx:176
PointLight::make_copy
virtual PandaNode * make_copy() const
Returns a newly-allocated PandaNode that is a shallow copy of this one.
Definition pointLight.cxx:110
PointLight::get_specular_color
get_specular_color
Returns the color of specular highlights generated by the light.
Definition pointLight.h:45
PointLight::register_with_read_factory
static void register_with_read_factory()
Tells the BamReader how to create objects of type PointLight.
Definition pointLight.cxx:221
PointLight::get_max_distance
get_max_distance
Returns the maximum distance at which the light has any effect, as previously specified by set_max_di...
Definition pointLight.h:53
PointLight::get_attenuation
get_attenuation
Returns the terms of the attenuation equation for the light.
Definition pointLight.h:49
PointLight::write_datagram
virtual void write_datagram(BamWriter *manager, Datagram &dg)
Writes the contents of this object to the datagram for shipping out to a Bam file.
Definition pointLight.cxx:230
TypeHandle
TypeHandle is the identifier used to differentiate C++ class types.
Definition typeHandle.h:81
TypedWritable
Base class for objects that can be written to and read from Bam files.
Definition typedWritable.h:35
config_pgraphnodes.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
datagramIterator.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
datagram.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
graphicsStateGuardianBase.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
indent
std::ostream & indent(std::ostream &out, int indent_level)
A handy function for doing text formatting.
Definition indent.cxx:20
pointLight.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.