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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_display"
xmlns:xi="http://www.w3.org/2001/XInclude">
<!-- See http://www.docbook.org/tdg/en/html/refentry.html. -->
<refmeta>
<refentrytitle>waffle_display</refentrytitle>
<manvolnum>3</manvolnum>
</refmeta>
<refnamediv>
<refname>waffle_display</refname>
<refname>waffle_display_connect</refname>
<refname>waffle_display_disconnect</refname>
<refname>waffle_display_supports_context_api</refname>
<refname>waffle_display_get_native</refname>
<refpurpose>class <classname>waffle_display</classname></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>
struct waffle_display;
</funcsynopsisinfo>
<funcprototype>
<funcdef>struct waffle_display* <function>waffle_display_connect</function></funcdef>
<paramdef>const char* <parameter>name</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>bool <function>waffle_display_disconnect</function></funcdef>
<paramdef>struct waffle_display *<parameter>self</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>bool <function>waffle_display_supports_context_api</function></funcdef>
<paramdef>struct waffle_display *<parameter>self</parameter></paramdef>
<paramdef>int32_t <parameter>context_api</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>union waffle_native_display* <function>waffle_display_get_native</function></funcdef>
<paramdef>struct waffle_display *<parameter>self</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<variablelist>
<varlistentry>
<term><type>struct waffle_display</type></term>
<listitem>
<para>
An opaque type.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><function>waffle_display_connect()</function></term>
<listitem>
<para>
Connect to a display. The interpretation of <parameter>name</parameter> differs according to the platform
given to <citerefentry><refentrytitle>waffle_init</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
</para>
<para>
On Android and CGL, <parameter>name</parameter> is ignored.
</para>
<para>
On the X11 platforms, GLX and X11/EGL, the function connects to the X11 display with the given
<parameter>name</parameter>. If <parameter>name</parameter> is null, then it uses the value of the
environment variable <envar>DISPLAY</envar>.
</para>
<para>
On Wayland, the function connects to the Wayland display with the given name. If <parameter>name</parameter> is null, then it
uses the value of the environment variable <envar>WAYLAND_DISPLAY</envar>.
</para>
<para>
On GBM, the function opens the device at the filepath <parameter>name</parameter>. If
<parameter>name</parameter> is null, then it iterates using udev through the set of card devices in the drm
subsystem, which are usually located in <filename>/dev/dri</filename>, and attempts to open each in turn
with <code>open(O_RDWR | O_CLOEXEC)</code> until successful.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><function>waffle_display_disconnect()</function></term>
<listitem>
<para>
Disconnect from the <type>waffle_display</type> and release it's memory. All pointers to waffle objects that
were created with the display become invalid.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><function>waffle_display_supports_context_api()</function></term>
<listitem>
<para>
Check if the display is capable of creating
a <citerefentry><refentrytitle>waffle_context</refentrytitle><manvolnum>3</manvolnum></citerefentry> with
the given <parameter>context_api</parameter>. See
<citerefentry><refentrytitle>waffle_config</refentrytitle><manvolnum>3</manvolnum></citerefentry> for
choices of <parameter>context_api</parameter> and expectations for each platform.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><function>waffle_display_get_native()</function></term>
<listitem>
<para>
Get the display's underlying native objects. Use
<citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> to deallocate the
returned pointer.
See <citerefentry><refentrytitle>waffle_native</refentrytitle><manvolnum>3</manvolnum></citerefentry>
for the definition of <type>union waffle_native_display</type>.
</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>
No errors are specific to any of the <type>waffle_display</type> functions.
</para>
</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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