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"
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::
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 }
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
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
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
This is the fundamental interface for extracting binary objects from a Bam file, as generated by a Ba...
Definition: bamReader.h:110
static WritableFactory * get_factory()
Returns the global WritableFactory for generating TypedWritable objects.
Definition: bamReader.I:177
A class to retrieve the individual data elements previously stored in a Datagram.
An instance of this class is passed to the Factory when requesting it to do its business and construc...
Definition: factoryParams.h:36
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
Defines a series of disconnected line segments with adjacency information, for use with geometry shad...
Encapsulates the data from a GeomPrimitive, pre-fetched for one stage of the pipeline.
This is an abstract base class for a family of classes that represent the fundamental geometry primit...
Definition: geomPrimitive.h:56
get_geom_rendering
Returns the set of GeomRendering bits that represent the rendering properties required to properly re...
Definition: geomPrimitive.h:73
This is a base class for the GraphicsStateGuardian class, which is itself a base class for the variou...
TypeHandle is the identifier used to differentiate C++ class types.
Definition: typeHandle.h:81
Base class for objects that can be written to and read from Bam files.
Definition: typedWritable.h:35
PT(GeomPrimitive) GeomLinesAdjacency
Returns the fundamental rendering type of this primitive: whether it is points, lines,...
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.