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"text/html; charset=UTF-8" /><title>glGetBufferPointerv
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.73.2" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"glGetBufferPointerv"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glGetBufferPointerv — return the pointer to a mapped buffer object's data store
</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">glGetBufferPointerv
</b>(
</code></td><td>GLenum
</td><td><var class=
"pdparam">target
</var>,
</td></tr><tr><td> </td><td>GLenum
</td><td><var class=
"pdparam">pname
</var>,
</td></tr><tr><td> </td><td>GLvoid **
</td><td><var class=
"pdparam">params
</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>pname
</code></em></span></dt><dd><p>
10 Specifies the pointer to be returned. The symbolic constant must be
<code class=
"constant">GL_BUFFER_MAP_POINTER
</code>.
11 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>params
</code></em></span></dt><dd><p>
12 Returns the pointer value specified by
<em class=
"parameter"><code>pname
</code></em>.
13 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
14 <code class=
"function">glGetBufferPointerv
</code> returns pointer information.
<em class=
"parameter"><code>pname
</code></em> is a symbolic constant
15 indicating the pointer to be returned, which must be
<code class=
"constant">GL_BUFFER_MAP_POINTER
</code>, the pointer
16 to which the buffer object's data store is mapped. If the data store is not currently mapped,
<code class=
"constant">NULL
</code> is returned.
17 <em class=
"parameter"><code>params
</code></em> is a pointer to a location in which to place the returned pointer value.
18 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"notes"></a><h2>Notes
</h2><p>
19 If an error is generated,
20 no change is made to the contents of
<em class=
"parameter"><code>params
</code></em>.
22 <code class=
"function">glGetBufferPointerv
</code> is available only if the GL version is
1.5 or greater.
24 Targets
<code class=
"constant">GL_PIXEL_PACK_BUFFER
</code> and
<code class=
"constant">GL_PIXEL_UNPACK_BUFFER
</code> are available
25 only if the GL version is
2.1 or greater.
27 The initial value for the pointer is
<code class=
"constant">NULL
</code>.
28 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
29 <code class=
"constant">GL_INVALID_ENUM
</code> is generated if
<em class=
"parameter"><code>target
</code></em> or
<em class=
"parameter"><code>pname
</code></em> is not an
32 <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>.
34 <code class=
"constant">GL_INVALID_OPERATION
</code> is generated if
<code class=
"function">glGetBufferPointerv
</code>
35 is executed between the execution of
<a class=
"citerefentry" href=
"glBegin.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBegin
</span></span></a>
36 and the corresponding execution of
<a class=
"citerefentry" href=
"glEnd.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnd
</span></span></a>.
37 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
38 <a class=
"citerefentry" href=
"glBindBuffer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBindBuffer
</span></span></a>,
39 <a class=
"citerefentry" href=
"glMapBuffer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glMapBuffer
</span></span></a>
40 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
41 Copyright
<span class=
"trademark"></span>©
2005 Addison-Wesley.
42 This material may be distributed subject to the terms and conditions set forth in
43 the Open Publication License, v
1.0,
8 June
1999.
44 <a class=
"ulink" href=
"http://opencontent.org/openpub/" target=
"_top">http://opencontent.org/openpub/
</a>.
45 </p></div></div></body></html>