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depthTestAttrib.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 depthTestAttrib.cxx
10 * @author drose
11 * @date 2002-03-04
12 */
13
14#include "depthTestAttrib.h"
15#include "graphicsStateGuardianBase.h"
16#include "dcast.h"
17#include "bamReader.h"
18#include "bamWriter.h"
19#include "datagram.h"
20#include "datagramIterator.h"
21
22 TypeHandle DepthTestAttrib::_type_handle;
23 int DepthTestAttrib::_attrib_slot;
24
25/**
26 * Constructs a new DepthTestAttrib object.
27 */
28CPT(RenderAttrib) DepthTestAttrib::
29 make(DepthTestAttrib::PandaCompareFunc mode) {
30 DepthTestAttrib *attrib = new DepthTestAttrib(mode);
31 return return_new(attrib);
32}
33
34/**
35 * Returns a RenderAttrib that corresponds to whatever the standard default
36 * properties for render attributes of this type ought to be.
37 */
38CPT(RenderAttrib) DepthTestAttrib::
39 make_default() {
40 return return_new(new DepthTestAttrib);
41}
42
43/**
44 *
45 */
46 void DepthTestAttrib::
47output(std::ostream &out) const {
48 out << get_type() << ":";
49 output_comparefunc(out,_mode);
50}
51
52/**
53 * Intended to be overridden by derived DepthTestAttrib types to return a
54 * unique number indicating whether this DepthTestAttrib is equivalent to the
55 * other one.
56 *
57 * This should return 0 if the two DepthTestAttrib objects are equivalent, a
58 * number less than zero if this one should be sorted before the other one,
59 * and a number greater than zero otherwise.
60 *
61 * This will only be called with two DepthTestAttrib objects whose get_type()
62 * functions return the same.
63 */
64 int DepthTestAttrib::
65compare_to_impl(const RenderAttrib *other) const {
66 const DepthTestAttrib *ta = (const DepthTestAttrib *)other;
67
68 return (int)_mode - (int)ta->_mode;
69}
70
71/**
72 * Intended to be overridden by derived RenderAttrib types to return a unique
73 * hash for these particular properties. RenderAttribs that compare the same
74 * with compare_to_impl(), above, should return the same hash; RenderAttribs
75 * that compare differently should return a different hash.
76 */
77 size_t DepthTestAttrib::
78get_hash_impl() const {
79 size_t hash = 0;
80 hash = int_hash::add_hash(hash, (int)_mode);
81 return hash;
82}
83
84/**
85 * Tells the BamReader how to create objects of type DepthTestAttrib.
86 */
87 void DepthTestAttrib::
88 register_with_read_factory() {
89 BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
90}
91
92/**
93 * Writes the contents of this object to the datagram for shipping out to a
94 * Bam file.
95 */
96 void DepthTestAttrib::
97 write_datagram(BamWriter *manager, Datagram &dg) {
98 RenderAttrib::write_datagram(manager, dg);
99
100 dg.add_int8(_mode);
101}
102
103/**
104 * This function is called by the BamReader's factory when a new object of
105 * type DepthTestAttrib is encountered in the Bam file. It should create the
106 * DepthTestAttrib and extract its information from the file.
107 */
108 TypedWritable *DepthTestAttrib::
109make_from_bam(const FactoryParams &params) {
110 DepthTestAttrib *attrib = new DepthTestAttrib;
111 DatagramIterator scan;
112 BamReader *manager;
113
114 parse_params(params, scan, manager);
115 attrib->fillin(scan, manager);
116
117 return attrib;
118}
119
120/**
121 * This internal function is called by make_from_bam to read in all of the
122 * relevant data from the BamFile for the new DepthTestAttrib.
123 */
124 void DepthTestAttrib::
125fillin(DatagramIterator &scan, BamReader *manager) {
126 RenderAttrib::fillin(scan, manager);
127
128 _mode = (PandaCompareFunc)scan.get_int8();
129}
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:30
DatagramIterator::get_int8
int8_t get_int8()
Extracts a signed 8-bit integer.
Definition datagramIterator.I:56
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_int8
void add_int8(int8_t value)
Adds a signed 8-bit integer to the datagram.
Definition datagram.I:42
DepthTestAttrib
Enables or disables writing to the depth buffer.
Definition depthTestAttrib.h:26
DepthTestAttrib::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 depthTestAttrib.cxx:97
DepthTestAttrib::register_with_read_factory
static void register_with_read_factory()
Tells the BamReader how to create objects of type DepthTestAttrib.
Definition depthTestAttrib.cxx:88
DepthTestAttrib::make_default
static ConstPointerTo< RenderAttrib > make_default()
Returns a RenderAttrib that corresponds to whatever the standard default properties for render attrib...
Definition depthTestAttrib.cxx:39
DepthTestAttrib::make
static ConstPointerTo< RenderAttrib > make(PandaCompareFunc mode)
Constructs a new DepthTestAttrib object.
Definition depthTestAttrib.cxx:29
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
RenderAttrib
This is the base class for a number of render attributes (other than transform) that may be set on sc...
Definition renderAttrib.h:51
RenderAttrib::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 renderAttrib.cxx:527
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
integer_hash< int >::add_hash
static size_t add_hash(size_t start, const int &key)
datagramIterator.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
datagram.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
dcast.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
depthTestAttrib.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
graphicsStateGuardianBase.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.