Document the GDK_VULKAN env var

This was not documented at all yet.
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Matthias Clasen 2018-01-10 00:11:25 -05:00
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</para> </para>
</formalpara> </formalpara>
<formalpara>
<title><envar>GDK_VULKAN</envar></title>
<para>
This variable can be set to a list of options that influence various aspects
of the Vulkan support in GTK+.
<variablelist>
<varlistentry>
<term>disable</term>
<listitem><para>Disable Vulkan support</para></listitem>
</varlistentry>
<varlistentry>
<term>validate </term>
<listitem><para>Enable the Vulkan validation layer</para></listitem>
</varlistentry>
</variablelist>
The special value <literal>all</literal> can be used to turn on all
options. The special value <literal>help</literal> can be used
to obtain a list of all supported options.
</para>
</formalpara>
<formalpara> <formalpara>
<title><envar>GTK_CSD</envar></title> <title><envar>GTK_CSD</envar></title>