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depthWriteAttrib.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 depthWriteAttrib.cxx
10 * @author drose
11 * @date 2002-03-04
12 */
13
14#include "depthWriteAttrib.h"
16#include "dcast.h"
17#include "bamReader.h"
18#include "bamWriter.h"
19#include "datagram.h"
20#include "datagramIterator.h"
21
22TypeHandle DepthWriteAttrib::_type_handle;
23int DepthWriteAttrib::_attrib_slot;
24
25/**
26 * Constructs a new DepthWriteAttrib object.
27 */
28CPT(RenderAttrib) DepthWriteAttrib::
29make(DepthWriteAttrib::Mode mode) {
30 DepthWriteAttrib *attrib = new DepthWriteAttrib(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) DepthWriteAttrib::
39make_default() {
40 return return_new(new DepthWriteAttrib);
41}
42
43/**
44 *
45 */
46void DepthWriteAttrib::
47output(std::ostream &out) const {
48 out << get_type() << ":";
49 switch (get_mode()) {
50 case M_off:
51 out << "off";
52 break;
53 case M_on:
54 out << "on";
55 break;
56 }
57}
58
59/**
60 * Intended to be overridden by derived DepthWriteAttrib types to return a
61 * unique number indicating whether this DepthWriteAttrib is equivalent to the
62 * other one.
63 *
64 * This should return 0 if the two DepthWriteAttrib objects are equivalent, a
65 * number less than zero if this one should be sorted before the other one,
66 * and a number greater than zero otherwise.
67 *
68 * This will only be called with two DepthWriteAttrib objects whose get_type()
69 * functions return the same.
70 */
71int DepthWriteAttrib::
72compare_to_impl(const RenderAttrib *other) const {
73 const DepthWriteAttrib *ta = (const DepthWriteAttrib *)other;
74
75 return (int)_mode - (int)ta->_mode;
76}
77
78/**
79 * Intended to be overridden by derived RenderAttrib types to return a unique
80 * hash for these particular properties. RenderAttribs that compare the same
81 * with compare_to_impl(), above, should return the same hash; RenderAttribs
82 * that compare differently should return a different hash.
83 */
84size_t DepthWriteAttrib::
85get_hash_impl() const {
86 size_t hash = 0;
87 hash = int_hash::add_hash(hash, (int)_mode);
88 return hash;
89}
90
91/**
92 * Tells the BamReader how to create objects of type DepthWriteAttrib.
93 */
96 BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
97}
98
99/**
100 * Writes the contents of this object to the datagram for shipping out to a
101 * Bam file.
102 */
104write_datagram(BamWriter *manager, Datagram &dg) {
105 RenderAttrib::write_datagram(manager, dg);
106
107 dg.add_int8(_mode);
108}
109
110/**
111 * This function is called by the BamReader's factory when a new object of
112 * type DepthWriteAttrib is encountered in the Bam file. It should create the
113 * DepthWriteAttrib and extract its information from the file.
114 */
115TypedWritable *DepthWriteAttrib::
116make_from_bam(const FactoryParams &params) {
118 DatagramIterator scan;
119 BamReader *manager;
120
121 parse_params(params, scan, manager);
122 attrib->fillin(scan, manager);
123
124 return attrib;
125}
126
127/**
128 * This internal function is called by make_from_bam to read in all of the
129 * relevant data from the BamFile for the new DepthWriteAttrib.
130 */
131void DepthWriteAttrib::
132fillin(DatagramIterator &scan, BamReader *manager) {
133 RenderAttrib::fillin(scan, manager);
134
135 _mode = (Mode)scan.get_int8();
136}
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.
static void register_with_read_factory()
Tells the BamReader how to create objects of type DepthWriteAttrib.
get_mode
Returns the depth write 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.
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.
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.