Panda3D
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"
16#include "dcast.h"
17#include "bamReader.h"
18#include "bamWriter.h"
19#include "datagram.h"
20#include "datagramIterator.h"
21
22TypeHandle DepthTestAttrib::_type_handle;
23int DepthTestAttrib::_attrib_slot;
24
25/**
26 * Constructs a new DepthTestAttrib object.
27 */
28CPT(RenderAttrib) DepthTestAttrib::
29make(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::
39make_default() {
40 return return_new(new DepthTestAttrib);
41}
42
43/**
44 *
45 */
46void 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 */
64int 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 */
77size_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 */
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 */
97write_datagram(BamWriter *manager, Datagram &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 */
108TypedWritable *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 */
124void DepthTestAttrib::
125fillin(DatagramIterator &scan, BamReader *manager) {
126 RenderAttrib::fillin(scan, manager);
127
128 _mode = (PandaCompareFunc)scan.get_int8();
129}
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
Enables or disables writing to the depth buffer.
virtual void write_datagram(BamWriter *manager, Datagram &dg)
Writes the contents of this object to the datagram for shipping out to a Bam file.
static void register_with_read_factory()
Tells the BamReader how to create objects of type DepthTestAttrib.
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
This is the base class for a number of render attributes (other than transform) that may be set on sc...
Definition: renderAttrib.h:51
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.
Definition: typedWritable.h:35
static size_t add_hash(size_t start, const Key &key)
Adds the indicated key into a running hash.
Definition: stl_compares.I:101
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
CPT(RenderAttrib) DepthTestAttrib
Constructs a new DepthTestAttrib object.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.