 your object keeps in the OpenGL machine</span></div>
<div class="line">   <span class="comment">// (e.g. textures, display lists, vertex shaders, etc.)</span></div>
<div class="line">   <span class="comment">// will need to be freed when closing, and rebuilt when it has</span></div>
<div class="line">   <span class="comment">// changed. In this object, these functions do nothing, and</span></div>
<div class="line">   <span class="comment">// could be omitted.</span></div>
<div class="line">   <a class="cod