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<?xml version='1.0'?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"file:///usr/share/xml/docbook/schema/dtd/4.2/docbookx.dtd">
<!--
Copyright Intel 2012
This manual page is licensed under the Creative Commons Attribution-ShareAlike 3.0 United States License (CC BY-SA 3.0
US). To view a copy of this license, visit http://creativecommons.org.license/by-sa/3.0/us.
-->
<refentry
id="waffle_get_proc_address"
xmlns:xi="http://www.w3.org/2001/XInclude">
<!-- See http://www.docbook.org/tdg/en/html/refentry.html. -->
<refmeta>
<refentrytitle>waffle_get_proc_address</refentrytitle>
<manvolnum>3</manvolnum>
</refmeta>
<refnamediv>
<refname>waffle_get_proc_address</refname>
<refpurpose>Query address of OpenGL functions</refpurpose>
</refnamediv>
<refentryinfo>
<title>Waffle Manual</title>
<productname>waffle</productname>
<xi:include href="common/author-chad.versace.xml"/>
<xi:include href="common/copyright.xml"/>
<xi:include href="common/legalnotice.xml"/>
</refentryinfo>
<refsynopsisdiv>
<funcsynopsis language="C">
<funcsynopsisinfo>
#include <waffle.h>
</funcsynopsisinfo>
<funcprototype>
<funcdef>void* <function>waffle_get_proc_address</function></funcdef>
<paramdef>const char *<parameter>name</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<variablelist>
<varlistentry>
<term><function>waffle_get_proc_address()</function></term>
<listitem>
<para>
On GLX, this redirects to
<citerefentry><refentrytitle><function>glXGetProcAddress</function></refentrytitle><manvolnum>3</manvolnum></citerefentry>.
On EGL, this redirects to
<citerefentry><refentrytitle><function>eglGetProcAddress</function></refentrytitle><manvolnum>3</manvolnum></citerefentry>.
On CGL, this function returns <constant>NULL</constant>
because there exists no <function>CGLGetProcAdress()</function>.
On WGL, this redirects to
<citerefentry><refentrytitle><function>wglGetProcAddress</function></refentrytitle><manvolnum>3</manvolnum></citerefentry>.
</para>
<para>
Some aspects of this function's behavior are platform-specific and non-intuitive.
For example,
<itemizedlist>
<listitem>
<para>
If the queried function is not available,
<function>waffle_get_proc_address()</function> may return a non-null pointer.
</para>
</listitem>
<listitem>
<para>
If the queried function is statically exposed by the OpenGL library of a given API,
then <function>waffle_get_proc_address()</function> may return a <constant>NULL</constant>.
</para>
</listitem>
<listitem>
<para>
Under Windows (WGL) a current context must be available before executing the function.
Otherwise <function>waffle_get_proc_address()</function> may return a <constant>NULL</constant>.
</para>
</listitem>
</itemizedlist>
</para>
<para>
For details on this function's behavior,
see the specification for the relevant platform:
the <ulink url="http://www.opengl.org/registry/doc/glx1.4.pdf">GLX 1.4 Specification</ulink>
the <ulink url="http://www.khronos.org/registry/egl/specs/eglspec.1.4.20110406.pdf">EGL 1.4 Specification</ulink>
or the <ulink url="http://msdn.microsoft.com/en-gb/library/windows/desktop/dd374386(v=vs.85).aspx">MSDN article</ulink>.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Errors</title>
<xi:include href="common/error-codes.xml"/>
<para>
No errors are specific to any functions listed in this manual page.
</para>
</refsect1>
<xi:include href="common/issues.xml"/>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>waffle</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry><refentrytitle>waffle_dl_sym</refentrytitle><manvolnum>3</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
<!--
vim:tw=120 et ts=2 sw=2:
-->
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