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<?xml version='1.0'?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/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_init"
xmlns:xi="http://www.w3.org/2001/XInclude">
<!-- See http://www.docbook.org/tdg/en/html/refentry.html. -->
<refmeta>
<refentrytitle>waffle_init</refentrytitle>
<manvolnum>3</manvolnum>
</refmeta>
<refnamediv>
<refname>waffle_init</refname>
<refpurpose>Initialize waffle's per-process global state</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>
<funcsynopsisinfo><![CDATA[#include <waffle.h>]]></funcsynopsisinfo>
<funcprototype>
<funcdef>bool <function>waffle_init</function></funcdef>
<paramdef>const int32_t <parameter>attrib_list</parameter>[]</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<function>waffle_init()</function> initializes the per-process global state of the waffle library with the
attributes specified in <parameter>attrib_list</parameter>. The set of attributes is documented below.
<parameter>attrib_list</parameter> consists of a zero-terminated sequence of name/value pairs.
</para>
<para>
Most waffle functions emit an error if called when waffle is unitialized. The small set of functions that can be
successfully called before initialization are explicitly documented as such.
</para>
<para>
If a call to <function>waffle_init()</function> fails, no global state is initialized and the caller may safely
attempt to call <function>waffle_init()</function> again. If waffle has already been initialized by a successful
call to <function>waffle_init()</function>, then calling <function>waffle_init()</function> again emits the error
<errorcode>WAFFLE_ERROR_ALREADY_INITIALIZED</errorcode>.
</para>
</refsect1>
<refsect1>
<title>Attributes</title>
<variablelist>
<varlistentry>
<term><constant>WAFFLE_PLATFORM</constant></term>
<listitem>
<para>
This attribute is required. Possible values are:
<variablelist>
<varlistentry>
<term><constant>WAFFLE_PLATFORM_ANDROID</constant></term>
<listitem>
<para>
[Android] Use EGL on Android.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>WAFFLE_PLATFORM_GBM</constant></term>
<listitem>
<para>
[Linux] Use EGL with GBM, the "Generic Buffer Manager" provided by libgbm. This platform is
capable of OpenGL rendering without a display manager.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>WAFFLE_PLATFORM_CGL</constant></term>
<listitem>
<para>
[MacOS] Use CGL to create the
<citerefentry><refentrytitle><function>waffle_config</function></refentrytitle><manvolnum>3</manvolnum></citerefentry>
and
<citerefentry><refentrytitle><function>waffle_context</function></refentrytitle><manvolnum>3</manvolnum></citerefentry>.
Use Cocoa to create the
<citerefentry><refentrytitle><function>waffle_window</function></refentrytitle><manvolnum>3</manvolnum></citerefentry>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>WAFFLE_PLATFORM_GLX</constant></term>
<listitem>
<para>
[Linux only, MacOS not yet supported]
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>WAFFLE_PLATFORM_WAYLAND</constant></term>
<listitem>
<para>
[Linux] Use EGL with the Wayland display server.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>WAFFLE_PLATFORM_X11_EGL</constant></term>
<listitem>
<para>
[Linux] Use EGL with the X11 display server.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Return Value</title>
<xi:include href="common/return-value.xml"/>
</refsect1>
<refsect1>
<title>Errors</title>
<xi:include href="common/error-codes.xml"/>
<para>
Listed are the errors specific to <function>waffle_init()</function>.
</para>
<variablelist>
<varlistentry>
<term><errorcode>WAFFLE_ERROR_ALREADY_INITIALIZED</errorcode></term>
<listitem>
<para>
Waffle has already been initialized with a successfull call to <function>waffle_init()</function>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><errorcode>WAFFLE_ERROR_BAD_ATTRIBUTE</errorcode></term>
<listitem>
<para>
An item in <parameter>attrib_list</parameter> is unrecognized or has an invalid value, or a required
attribute is missing.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><errorcode>WAFFLE_ERROR_BUILT_WITHOUT_SUPPORT</errorcode></term>
<listitem>
<para>
Waffle was built without support for the requested attribute.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Example</title>
<para>
Initialize waffle for X11/EGL.
</para>
<programlisting>
<![CDATA[
#include <waffle.h>
static const int32_t init_attrib_list[] = {
WAFFLE_PLATFORM, WAFFLE_PLATFORM_X11_EGL,
0,
};
int
main()
{
bool ok = waffle_init(init_attrib_list);
if (ok)
return EXIT_SUCCESS;
else
return EXIT_FAILURE;
}
]]>
</programlisting>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>waffle</refentrytitle><manvolnum>7</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
<!--
vim:tw=120 et ts=2 sw=2:
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