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<?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="glGetBufferPointerv">
<refmeta>
<refmetainfo>
<copyright>
<year>2005</year>
<holder>Sams Publishing</holder>
</copyright>
</refmetainfo>
<refentrytitle>glGetBufferPointerv</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>glGetBufferPointerv</refname>
<refpurpose>return the pointer to a mapped buffer object's data store</refpurpose>
</refnamediv>
<refsynopsisdiv><title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>void <function>glGetBufferPointerv</function></funcdef>
<paramdef>GLenum <parameter>target</parameter></paramdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>GLvoid ** <parameter>params</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="parameters"><title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>target</parameter></term>
<listitem>
<para>
Specifies the target buffer object.
The symbolic constant must be <constant>GL_ARRAY_BUFFER</constant>,
<constant>GL_ELEMENT_ARRAY_BUFFER</constant>,
<constant>GL_PIXEL_PACK_BUFFER</constant>, or
<constant>GL_PIXEL_UNPACK_BUFFER</constant>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>pname</parameter></term>
<listitem>
<para>
Specifies the pointer to be returned. The symbolic constant must be <constant>GL_BUFFER_MAP_POINTER</constant>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>params</parameter></term>
<listitem>
<para>
Returns the pointer value specified by <parameter>pname</parameter>.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="description"><title>Description</title>
<para>
<function>glGetBufferPointerv</function> returns pointer information. <parameter>pname</parameter> is a symbolic constant
indicating the pointer to be returned, which must be <constant>GL_BUFFER_MAP_POINTER</constant>, the pointer
to which the buffer object's data store is mapped. If the data store is not currently mapped, <constant>NULL</constant> is returned.
<parameter>params</parameter> is a pointer to a location in which to place the returned pointer value.
</para>
</refsect1>
<refsect1 id="notes"><title>Notes</title>
<para>
If an error is generated,
no change is made to the contents of <parameter>params</parameter>.
</para>
<para>
<function>glGetBufferPointerv</function> is available only if the GL version is 1.5 or greater.
</para>
<para>
Targets <constant>GL_PIXEL_PACK_BUFFER</constant> and <constant>GL_PIXEL_UNPACK_BUFFER</constant> are available
only if the GL version is 2.1 or greater.
</para>
<para>
The initial value for the pointer is <constant>NULL</constant>.
</para>
</refsect1>
<refsect1 id="errors"><title>Errors</title>
<para>
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> or <parameter>pname</parameter> is not an
accepted value.
</para>
<para>
<constant>GL_INVALID_OPERATION</constant> is generated if the reserved buffer object name 0 is bound to <parameter>target</parameter>.
</para>
<para>
<constant>GL_INVALID_OPERATION</constant> is generated if <function>glGetBufferParameteriv</function>
is executed between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
and the corresponding execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
</para>
</refsect1>
<refsect1 id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glMapBuffer</refentrytitle></citerefentry>
</para>
</refsect1>
<refsect1 id="Copyright"><title>Copyright</title>
<para>
Copyright <trademark class="copyright"></trademark> 2005 Addison-Wesley.
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>