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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 xml:base="" id="eglGetProcAddress">
<refentryinfo>
<copyright>
<year>2003-2014</year>
<holder>The Khronos Group Inc.</holder>
</copyright>
</refentryinfo>
<refmeta>
<refentrytitle>eglGetProcAddress</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>eglGetProcAddress</refname>
<refpurpose>
return a <acronym>GL</acronym> or an <acronym>EGL</acronym>
extension function
</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>void (* <function>eglGetProcAddress</function>)()</funcdef>
<paramdef>char const * <parameter>procname</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="parameters"><title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>procname</parameter></term>
<listitem>
<para>
Specifies the name of the function to return.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="description"><title>Description</title>
<para>
<function>eglGetProcAddress</function> returns the address of
the extension function named by <parameter>procname</parameter>.
<parameter>procname</parameter>
must be a null-terminated string. The pointer returned
should be cast to a function pointer type matching the extension
function's definition in that extension specification. A return value
of <constant>NULL</constant> indicates that the specific
function does not exist for the <acronym>EGL</acronym> implementation.
</para>
<para>
A non-<constant>NULL</constant> return value does not guarantee
that an extension function is actually supported at runtime. The client
must also query
<citerefentry><refentrytitle>glGetString</refentrytitle></citerefentry>(<constant>GL_EXTENSIONS</constant>) or
<citerefentry><refentrytitle>eglQueryString</refentrytitle></citerefentry>(<parameter>display</parameter>,
<constant>EGL_EXTENSIONS</constant>) to determine if an
extension is supported by a particular context or display.
</para>
<para>
Function pointers returned by
<function>eglGetProcAddress</function> are independent of the
display and the currently bound context and may be used by any context
which supports the extension.
</para>
<para>
<function>eglGetProcAddress</function> may be queried for all
<acronym>GL</acronym> and <acronym>EGL</acronym> extension functions.
</para>
</refsect1>
<refsect1 id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>glGetString</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>eglQueryString</refentrytitle></citerefentry> </para>
</refsect1>
<refsect3 id="Copyright"><title></title>
<!-- Content included from copyright.inc.xsl -->
<imageobject>
<imagedata fileref="KhronosLogo.jpg" format="jpg" />
</imageobject>
<para />
</refsect3>
</refentry>
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