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shadeModelAttrib.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 shadeModelAttrib.cxx
10 * @author drose
11 * @date 2005-03-14
12 */
13
14#include "shadeModelAttrib.h"
16#include "dcast.h"
17#include "bamReader.h"
18#include "bamWriter.h"
19#include "datagram.h"
20#include "datagramIterator.h"
21
22TypeHandle ShadeModelAttrib::_type_handle;
23int ShadeModelAttrib::_attrib_slot;
24
25/**
26 * Constructs a new ShadeModelAttrib object that specifies whether to draw
27 * polygons with flat shading or with per-vertex (smooth) shading.
28 */
29CPT(RenderAttrib) ShadeModelAttrib::
30make(ShadeModelAttrib::Mode mode) {
31 ShadeModelAttrib *attrib = new ShadeModelAttrib(mode);
32 return return_new(attrib);
33}
34
35/**
36 * Returns a RenderAttrib that corresponds to whatever the standard default
37 * properties for render attributes of this type ought to be.
38 */
39CPT(RenderAttrib) ShadeModelAttrib::
40make_default() {
41 return return_new(new ShadeModelAttrib(M_smooth));
42}
43
44/**
45 *
46 */
47void ShadeModelAttrib::
48output(std::ostream &out) const {
49 out << get_type() << ":";
50 switch (get_mode()) {
51 case M_flat:
52 out << "flat";
53 break;
54
55 case M_smooth:
56 out << "smooth";
57 break;
58 }
59}
60
61/**
62 * Intended to be overridden by derived ShadeModelAttrib types to return a
63 * unique number indicating whether this ShadeModelAttrib is equivalent to the
64 * other one.
65 *
66 * This should return 0 if the two ShadeModelAttrib objects are equivalent, a
67 * number less than zero if this one should be sorted before the other one,
68 * and a number greater than zero otherwise.
69 *
70 * This will only be called with two ShadeModelAttrib objects whose get_type()
71 * functions return the same.
72 */
73int ShadeModelAttrib::
74compare_to_impl(const RenderAttrib *other) const {
75 const ShadeModelAttrib *ta = (const ShadeModelAttrib *)other;
76 return (int)_mode - (int)ta->_mode;
77}
78
79/**
80 * Intended to be overridden by derived RenderAttrib types to return a unique
81 * hash for these particular properties. RenderAttribs that compare the same
82 * with compare_to_impl(), above, should return the same hash; RenderAttribs
83 * that compare differently should return a different hash.
84 */
85size_t ShadeModelAttrib::
86get_hash_impl() const {
87 size_t hash = 0;
88 hash = int_hash::add_hash(hash, (int)_mode);
89 return hash;
90}
91
92/**
93 * Intended to be overridden by derived RenderAttrib types to specify how two
94 * consecutive RenderAttrib objects of the same type interact.
95 *
96 * This should return the result of applying the other RenderAttrib to a node
97 * in the scene graph below this RenderAttrib, which was already applied. In
98 * most cases, the result is the same as the other RenderAttrib (that is, a
99 * subsequent RenderAttrib completely replaces the preceding one). On the
100 * other hand, some kinds of RenderAttrib (for instance, ColorTransformAttrib)
101 * might combine in meaningful ways.
102 */
103CPT(RenderAttrib) ShadeModelAttrib::
104compose_impl(const RenderAttrib *other) const {
105 const ShadeModelAttrib *ta = (const ShadeModelAttrib *)other;
106
107 Mode mode = ta->get_mode();
108 return make(mode);
109}
110
111/**
112 * Tells the BamReader how to create objects of type ShadeModelAttrib.
113 */
114void ShadeModelAttrib::
115register_with_read_factory() {
116 BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
117}
118
119/**
120 * Writes the contents of this object to the datagram for shipping out to a
121 * Bam file.
122 */
124write_datagram(BamWriter *manager, Datagram &dg) {
125 RenderAttrib::write_datagram(manager, dg);
126
127 dg.add_int8(_mode);
128}
129
130/**
131 * This function is called by the BamReader's factory when a new object of
132 * type ShadeModelAttrib is encountered in the Bam file. It should create the
133 * ShadeModelAttrib and extract its information from the file.
134 */
135TypedWritable *ShadeModelAttrib::
136make_from_bam(const FactoryParams &params) {
137 ShadeModelAttrib *attrib = new ShadeModelAttrib(M_smooth);
138 DatagramIterator scan;
139 BamReader *manager;
140
141 parse_params(params, scan, manager);
142 attrib->fillin(scan, manager);
143
144 return attrib;
145}
146
147/**
148 * This internal function is called by make_from_bam to read in all of the
149 * relevant data from the BamFile for the new ShadeModelAttrib.
150 */
151void ShadeModelAttrib::
152fillin(DatagramIterator &scan, BamReader *manager) {
153 RenderAttrib::fillin(scan, manager);
154
155 _mode = (Mode)scan.get_int8();
156}
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
This is the fundamental interface for writing binary objects to a Bam file, to be extracted later by ...
Definition bamWriter.h:63
A class to retrieve the individual data elements previously stored in a Datagram.
int8_t get_int8()
Extracts a signed 8-bit integer.
An ordered list of data elements, formatted in memory for transmission over a socket or writing to a ...
Definition datagram.h:38
void add_int8(int8_t value)
Adds a signed 8-bit integer to the datagram.
Definition datagram.I:42
An instance of this class is passed to the Factory when requesting it to do its business and construc...
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
This is the base class for a number of render attributes (other than transform) that may be set on sc...
virtual void write_datagram(BamWriter *manager, Datagram &dg)
Writes the contents of this object to the datagram for shipping out to a Bam file.
Specifies whether flat shading (per-polygon) or smooth shading (per-vertex) is in effect.
get_mode
Returns the shade mode.
virtual void write_datagram(BamWriter *manager, Datagram &dg)
Writes the contents of this object to the datagram for shipping out to a Bam file.
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.
static size_t add_hash(size_t start, const Key &key)
Adds the indicated key into a running hash.
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.