Panda3D

geomLinesAdjacency.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 geomLinesAdjacency.cxx
10 * @author rdb
11 * @date 2018-03-01
12 */
13
14 #include "geomLinesAdjacency.h"
15 #include "pStatTimer.h"
16 #include "bamReader.h"
17 #include "bamWriter.h"
18 #include "graphicsStateGuardianBase.h"
19 #include "geomVertexReader.h"
20 #include "geomVertexWriter.h"
21
22 TypeHandle GeomLinesAdjacency::_type_handle;
23
24 /**
25 *
26 */
27 GeomLinesAdjacency::
28 GeomLinesAdjacency(GeomEnums::UsageHint usage_hint) :
29 GeomPrimitive(usage_hint)
30 {
31 }
32
33 /**
34 *
35 */
36 GeomLinesAdjacency::
37 GeomLinesAdjacency(const GeomLinesAdjacency &copy) :
38 GeomPrimitive(copy)
39 {
40 }
41
42 /**
43 *
44 */
45 GeomLinesAdjacency::
46 ~GeomLinesAdjacency() {
47 }
48
49 /**
50 *
51 */
52 PT(GeomPrimitive) GeomLinesAdjacency::
53 make_copy() const {
54 return new GeomLinesAdjacency(*this);
55 }
56
57 /**
58 * Returns the fundamental rendering type of this primitive: whether it is
59 * points, lines, or polygons.
60 *
61 * This is used to set up the appropriate antialiasing settings when
62 * AntialiasAttrib::M_auto is in effect; it also implies the type of primitive
63 * that will be produced when decompose() is called.
64 */
65 GeomPrimitive::PrimitiveType GeomLinesAdjacency::
66 get_primitive_type() const {
67 return PT_lines;
68 }
69
70 /**
71 * Returns the set of GeomRendering bits that represent the rendering
72 * properties required to properly render this primitive.
73 */
74 int GeomLinesAdjacency::
75 get_geom_rendering() const {
76 return GeomPrimitive::get_geom_rendering() | GR_adjacency;
77 }
78
79 /**
80 * If the primitive type is a simple type in which all primitives have the
81 * same number of vertices, like lines, returns the number of vertices per
82 * primitive. If the primitive type is a more complex type in which different
83 * primitives might have different numbers of vertices, for instance a line
84 * strip, returns 0.
85 */
86 int GeomLinesAdjacency::
87 get_num_vertices_per_primitive() const {
88 return 4;
89 }
90
91 /**
92 * Returns the minimum number of vertices that must be added before
93 * close_primitive() may legally be called.
94 */
95 int GeomLinesAdjacency::
96 get_min_num_vertices_per_primitive() const {
97 return 4;
98 }
99
100 /**
101 * Calls the appropriate method on the GSG to draw the primitive.
102 */
103 bool GeomLinesAdjacency::
104 draw(GraphicsStateGuardianBase *gsg, const GeomPrimitivePipelineReader *reader,
105 bool force) const {
106 return gsg->draw_lines_adj(reader, force);
107 }
108
109 /**
110 * Tells the BamReader how to create objects of type Geom.
111 */
112 void GeomLinesAdjacency::
113 register_with_read_factory() {
114 BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
115 }
116
117 /**
118 * This function is called by the BamReader's factory when a new object of
119 * type Geom is encountered in the Bam file. It should create the Geom and
120 * extract its information from the file.
121 */
122 TypedWritable *GeomLinesAdjacency::
123 make_from_bam(const FactoryParams &params) {
124 GeomLinesAdjacency *object = new GeomLinesAdjacency(UH_unspecified);
125 DatagramIterator scan;
126 BamReader *manager;
127
128 parse_params(params, scan, manager);
129 object->fillin(scan, manager);
130
131 return object;
132 }
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_factory
static WritableFactory * get_factory()
Returns the global WritableFactory for generating TypedWritable objects.
Definition: bamReader.I:177
DatagramIterator
A class to retrieve the individual data elements previously stored in a Datagram.
Definition: datagramIterator.h:27
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
GeomLinesAdjacency
Defines a series of disconnected line segments with adjacency information, for use with geometry shad...
Definition: geomLinesAdjacency.h:26
GeomPrimitivePipelineReader
Encapsulates the data from a GeomPrimitive, pre-fetched for one stage of the pipeline.
Definition: geomPrimitive.h:352
GeomPrimitive
This is an abstract base class for a family of classes that represent the fundamental geometry primit...
Definition: geomPrimitive.h:56
GeomPrimitive::get_geom_rendering
get_geom_rendering
Returns the set of GeomRendering bits that represent the rendering properties required to properly re...
Definition: geomPrimitive.h:73
GraphicsStateGuardianBase
This is a base class for the GraphicsStateGuardian class, which is itself a base class for the variou...
Definition: graphicsStateGuardianBase.h:110
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
PT
PT(GeomPrimitive) GeomLinesAdjacency
Returns the fundamental rendering type of this primitive: whether it is points, lines,...
Definition: geomLinesAdjacency.cxx:52
geomLinesAdjacency.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
geomVertexReader.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
geomVertexWriter.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
graphicsStateGuardianBase.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
pStatTimer.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.