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"text/html; charset=UTF-8" /><title>glGetBufferParameteriv
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.73.2" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"glGetBufferParameteriv"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glGetBufferParameteriv — return parameters of a buffer object
</p></div><div class=
"refsynopsisdiv"><h2>C Specification
</h2><div class=
"funcsynopsis"><table border=
"0" summary=
"Function synopsis" cellspacing=
"0" cellpadding=
"0"><tr><td><code class=
"funcdef">void
<b class=
"fsfunc">glGetBufferParameteriv
</b>(
</code></td><td>GLenum
</td><td><var class=
"pdparam">target
</var>,
</td></tr><tr><td> </td><td>GLenum
</td><td><var class=
"pdparam">value
</var>,
</td></tr><tr><td> </td><td>GLint *
</td><td><var class=
"pdparam">data
</var><code>)
</code>;
</td></tr></table></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"parameters"></a><h2>Parameters
</h2><div class=
"variablelist"><dl><dt><span class=
"term"><em class=
"parameter"><code>target
</code></em></span></dt><dd><p>
4 Specifies the target buffer object.
5 The symbolic constant must be
<code class=
"constant">GL_ARRAY_BUFFER
</code>,
6 <code class=
"constant">GL_ELEMENT_ARRAY_BUFFER
</code>,
7 <code class=
"constant">GL_PIXEL_PACK_BUFFER
</code>, or
8 <code class=
"constant">GL_PIXEL_UNPACK_BUFFER
</code>.
9 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>value
</code></em></span></dt><dd><p>
10 Specifies the symbolic name of a buffer object parameter.
11 Accepted values are
<code class=
"constant">GL_BUFFER_ACCESS
</code>,
<code class=
"constant">GL_BUFFER_MAPPED
</code>,
12 <code class=
"constant">GL_BUFFER_SIZE
</code>, or
<code class=
"constant">GL_BUFFER_USAGE
</code>.
13 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>data
</code></em></span></dt><dd><p>
14 Returns the requested parameter.
15 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
16 <code class=
"function">glGetBufferParameteriv
</code> returns in
<em class=
"parameter"><code>data
</code></em> a selected parameter of the buffer object
17 specified by
<em class=
"parameter"><code>target
</code></em>.
19 <em class=
"parameter"><code>value
</code></em> names a specific buffer object parameter, as follows:
20 </p><div class=
"variablelist"><dl><dt><span class=
"term"><code class=
"constant">GL_BUFFER_ACCESS
</code></span></dt><dd><p>
21 <em class=
"parameter"><code>params
</code></em> returns the access policy set while mapping the buffer object.
22 The initial value is
<code class=
"constant">GL_READ_WRITE
</code>.
23 </p></dd><dt><span class=
"term"><code class=
"constant">GL_BUFFER_MAPPED
</code></span></dt><dd><p>
24 <em class=
"parameter"><code>params
</code></em> returns a flag indicating whether the buffer object is currently
25 mapped. The initial value is
<code class=
"constant">GL_FALSE
</code>.
26 </p></dd><dt><span class=
"term"><code class=
"constant">GL_BUFFER_SIZE
</code></span></dt><dd><p>
27 <em class=
"parameter"><code>params
</code></em> returns the size of the buffer object, measured in bytes.
28 The initial value is
0.
29 </p></dd><dt><span class=
"term"><code class=
"constant">GL_BUFFER_USAGE
</code></span></dt><dd><p>
30 <em class=
"parameter"><code>params
</code></em> returns the buffer object's usage pattern. The initial value is
31 <code class=
"constant">GL_STATIC_DRAW
</code>.
32 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"notes"></a><h2>Notes
</h2><p>
33 If an error is generated,
34 no change is made to the contents of
<em class=
"parameter"><code>data
</code></em>.
36 <code class=
"function">glGetBufferParameteriv
</code> is available only if the GL version is
1.5 or greater.
38 Targets
<code class=
"constant">GL_PIXEL_PACK_BUFFER
</code> and
<code class=
"constant">GL_PIXEL_UNPACK_BUFFER
</code> are available
39 only if the GL version is
2.1 or greater.
40 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
41 <code class=
"constant">GL_INVALID_ENUM
</code> is generated if
<em class=
"parameter"><code>target
</code></em> or
<em class=
"parameter"><code>value
</code></em> is not an
44 <code class=
"constant">GL_INVALID_OPERATION
</code> is generated if the reserved buffer object name
0 is bound to
<em class=
"parameter"><code>target
</code></em>.
46 <code class=
"constant">GL_INVALID_OPERATION
</code> is generated if
<code class=
"function">glGetBufferParameteriv
</code>
47 is executed between the execution of
<a class=
"citerefentry" href=
"glBegin.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBegin
</span></span></a>
48 and the corresponding execution of
<a class=
"citerefentry" href=
"glEnd.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnd
</span></span></a>.
49 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
50 <a class=
"citerefentry" href=
"glBindBuffer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBindBuffer
</span></span></a>,
51 <a class=
"citerefentry" href=
"glBufferData.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBufferData
</span></span></a>,
52 <a class=
"citerefentry" href=
"glMapBuffer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glMapBuffer
</span></span></a>,
53 <a class=
"citerefentry" href=
"glUnmapBuffer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glUnmapBuffer
</span></span></a>
54 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
55 Copyright
<span class=
"trademark"></span>©
2005 Addison-Wesley.
56 This material may be distributed subject to the terms and conditions set forth in
57 the Open Publication License, v
1.0,
8 June
1999.
58 <a class=
"ulink" href=
"http://opencontent.org/openpub/" target=
"_top">http://opencontent.org/openpub/
</a>.
59 </p></div></div></body></html>