1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
<refentry id="glGetFramebufferParameter">
<refentryinfo>
<copyright>
<year>2013</year>
<holder>Khronos Group</holder>
</copyright>
</refentryinfo>
<refmeta>
<refentrytitle>glGetFramebufferParameter</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>glGetFramebufferParameter</refname>
<refpurpose>retrieve a named parameter from a framebuffer</refpurpose>
</refnamediv>
<refsynopsisdiv><title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>void <function>glGetFramebufferParameteriv</function></funcdef>
<paramdef>GLenum <parameter>target</parameter></paramdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>GLint * <parameter>params</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="parameters"><title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>target</parameter></term>
<listitem>
<para>
The target of the operation, which must be <constant>GL_READ_FRAMEBUFFER</constant>,
<constant>GL_DRAW_FRAMEBUFFER</constant> or <constant>GL_FRAMEBUFFER</constant>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>pname</parameter></term>
<listitem>
<para>
A token indicating the parameter to be retrieved.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>params</parameter></term>
<listitem>
<para>
The address of a variable to receive the value of the parameter named <parameter>pname</parameter>.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="description"><title>Description</title>
<para>
<function>glGetFramebufferParameter</function> retrieves the current value of the parameter
named <parameter>pname</parameter> from the framebuffer bound to <parameter>target</parameter>.
<parameter>target</parameter> must be <constant>GL_READ_FRAMEBFUFFER</constant>,
<constant>GL_DRAW_FRAMEBUFFER</constant> or <constant>GL_FRAMEBUFFER</constant>. The
token <constant>GL_FRAMEBUFFER</constant> is treated as <constant>GL_DRAW_FRAMEBUFFER</constant>.
A non-default framebuffer must be bound to <parameter>target</parameter>.
</para>
<para>
<parameter>pname</parameter> specifies the parameter to be retrieved. The values retrieved from
the framebuffer are written into the variable whose address is given by <parameter>params</parameter>.
The following symbols are accepted in <parameter>pname</parameter>:
</para>
<variablelist>
<varlistentry>
<term><constant>GL_FRAMEBUFFER_DEFAULT_WIDTH</constant></term>
<listitem>
<para>
The value of <constant>GL_FRAMEBUFFER_DEFAULT_WIDTH</constant> for the framebuffer is written to the
single integer variable whose address is given by <parameter>params</parameter>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_FRAMEBUFFER_DEFAULT_HEIGHT</constant></term>
<listitem>
<para>
The value of <constant>GL_FRAMEBUFFER_DEFAULT_HEIGHT</constant> for the framebuffer is written to the
single integer variable whose address is given by <parameter>params</parameter>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_FRAMEBUFFER_DEFAULT_LAYERS</constant></term>
<listitem>
<para>
The value of <constant>GL_FRAMEBUFFER_DEFAULT_LAYERS</constant> for the framebuffer is written to the
single integer variable whose address is given by <parameter>params</parameter>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_FRAMEBUFFER_DEFAULT_SAMPLES</constant></term>
<listitem>
<para>
The value of <constant>GL_FRAMEBUFFER_DEFAULT_SAMPLES</constant> for the framebuffer is written to the
single integer variable whose address is given by <parameter>params</parameter>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS</constant></term>
<listitem>
<para>
If the value of <constant>GL_FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS</constant> for the framebuffer is <constant>GL_TRUE</constant>
then the single integer variable whose address is in <parameter>params</parameter> is set to one,
otherwise it is set to zero.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="errors"><title>Errors</title>
<para>
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> is not one of the accepted
framebuffer targets.
</para>
<para>
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>pname</parameter> is not one of the accepted
parameter names.
</para>
<para>
<constant>GL_INVALID_OPERATION</constant> is generated if the default framebuffer is bound to <parameter>target</parameter>.
</para>
<para>
<parameter>params</parameter> should be the address of a variable to which the client has write access otherwise
undefined behavior, including process termination may occur.
</para>
</refsect1>
<refsect1 id="associatedgets"><title>Associated Gets</title>
<para>
<citerefentry><refentrytitle>glGetFramebufferParameteriv</refentrytitle></citerefentry>.
</para>
</refsect1>
<refsect1 id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>glFramebufferParameteri</refentrytitle></citerefentry>.
</para>
</refsect1>
<refsect1 id="Copyright"><title>Copyright</title>
<para>
Copyright <trademark class="copyright"></trademark> 2013 Khronos Group.
This material may be distributed subject to the terms and conditions set forth in
the Open Publication License, v 1.0, 8 June 1999.
<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
</para>
</refsect1>
</refentry>
|
