 calling <code>vkGetInstanceProcAddr</code> with a platform-specific query of the Vulkan loader as a fallback.</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">instance</td><td>The Vulkan instance to query, or <code>NULL</code> to retrieve functions related to instance creation. </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">procname</td><td>The ASCII encoded name of the function. </td></tr>
  </table>