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<?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><link rel="stylesheet" type="text/css" href="opengl-man.css" /><title>glGetBufferPointerv - OpenGL 4 Reference Pages</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div class="refentry"><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" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glGetBufferPointerv</strong>(</code></td><td>GLenum <var class="pdparam">target</var>, </td></tr><tr><td> </td><td>GLenum <var class="pdparam">pname</var>, </td></tr><tr><td> </td><td>GLvoid ** <var class="pdparam">params</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>target</code></em></span></dt><dd><p>
Specifies the target buffer object.
The symbolic constant must be
<code class="constant">GL_ARRAY_BUFFER</code>,
<code class="constant">GL_ATOMIC_COUNTER_BUFFER</code>,
<code class="constant">GL_COPY_READ_BUFFER</code>,
<code class="constant">GL_COPY_WRITE_BUFFER</code>,
<code class="constant">GL_DRAW_INDIRECT_BUFFER</code>,
<code class="constant">GL_DISPATCH_INDIRECT_BUFFER</code>,
<code class="constant">GL_ELEMENT_ARRAY_BUFFER</code>,
<code class="constant">GL_PIXEL_PACK_BUFFER</code>,
<code class="constant">GL_PIXEL_UNPACK_BUFFER</code>,
<code class="constant">GL_QUERY_BUFFER</code>,
<code class="constant">GL_SHADER_STORAGE_BUFFER</code>,
<code class="constant">GL_TEXTURE_BUFFER</code>,
<code class="constant">GL_TRANSFORM_FEEDBACK_BUFFER</code>, or
<code class="constant">GL_UNIFORM_BUFFER</code>.
</p></dd><dt><span class="term"><em class="parameter"><code>pname</code></em></span></dt><dd><p>
Specifies the pointer to be returned. The symbolic constant must be <code class="constant">GL_BUFFER_MAP_POINTER</code>.
</p></dd><dt><span class="term"><em class="parameter"><code>params</code></em></span></dt><dd><p>
Returns the pointer value specified by <em class="parameter"><code>pname</code></em>.
</p></dd></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p>
<code class="function">glGetBufferPointerv</code> returns pointer information. <em class="parameter"><code>pname</code></em> is a symbolic constant
indicating the pointer to be returned, which must be <code class="constant">GL_BUFFER_MAP_POINTER</code>, the pointer
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.
<em class="parameter"><code>params</code></em> is a pointer to a location in which to place the returned pointer value.
</p></div><div class="refsect1"><a id="notes"></a><h2>Notes</h2><p>
If an error is generated,
no change is made to the contents of <em class="parameter"><code>params</code></em>.
</p><p>
The initial value for the pointer is <code class="constant">NULL</code>.
</p><p>
The <code class="constant">GL_ATOMIC_COUNTER_BUFFER</code> target is available only if the GL version is 4.2 or greater.
</p><p>
The <code class="constant">GL_DISPATCH_INDIRECT_BUFFER</code> and <code class="constant">GL_SHADER_STORAGE_BUFFER</code> targets are available only if the GL version is 4.3 or greater.
</p><p>
The <code class="constant">GL_QUERY_BUFFER</code> target is available only if the GL version is 4.4 or greater.
</p></div><div class="refsect1"><a id="errors"></a><h2>Errors</h2><p>
<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
accepted value.
</p><p>
<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>.
</p></div><div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>
<a class="citerefentry" href="glBindBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glBindBuffer</span></span></a>,
<a class="citerefentry" href="glMapBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glMapBuffer</span></span></a>
</p></div><div class="refsect1"><a id="Copyright"></a><h2>Copyright</h2><p>
Copyright <span class="trademark"></span>© 2005 Addison-Wesley.
Copyright <span class="trademark"></span>© 2011-2013 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.
<a class="ulink" href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
</p></div></div></body></html>
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