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<h1 class="title">main.cpp Example File</h1>
<span class="subtitle">hellogles3/main.cpp</span>
<!-- $$$hellogles3/main.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
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  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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  <span class="preprocessor">#include &lt;QGuiApplication&gt;</span>
  <span class="preprocessor">#include &lt;QSurfaceFormat&gt;</span>
  <span class="preprocessor">#include &lt;QOpenGLContext&gt;</span>

  <span class="preprocessor">#include &quot;glwindow.h&quot;</span>

  <span class="comment">// This example demonstrates easy, cross-platform usage of OpenGL ES 3.0 functions via</span>
  <span class="comment">// QOpenGLExtraFunctions in an application that works identically on desktop platforms</span>
  <span class="comment">// with OpenGL 3.3 and mobile/embedded devices with OpenGL ES 3.0.</span>

  <span class="comment">// The code is always the same, with the exception of two places: (1) the OpenGL context</span>
  <span class="comment">// creation has to have a sufficiently high version number for the features that are in</span>
  <span class="comment">// use, and (2) the shader code's version directive is different.</span>

  <span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span>argv<span class="operator">[</span><span class="operator">]</span>)
  {
      <span class="type"><a href="../qtgui/qguiapplication.html">QGuiApplication</a></span> app(argc<span class="operator">,</span> argv);

      <span class="type"><a href="../qtgui/qsurfaceformat.html">QSurfaceFormat</a></span> fmt;
      fmt<span class="operator">.</span>setDepthBufferSize(<span class="number">24</span>);

      <span class="comment">// Request OpenGL 3.3 core or OpenGL ES 3.0.</span>
      <span class="keyword">if</span> (<span class="type"><a href="../qtgui/qopenglcontext.html">QOpenGLContext</a></span><span class="operator">::</span>openGLModuleType() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtgui/qopenglcontext.html">QOpenGLContext</a></span><span class="operator">::</span>LibGL) {
          <a href="../qtcore/qtglobal.html#qDebug">qDebug</a>(<span class="string">&quot;Requesting 3.3 core context&quot;</span>);
          fmt<span class="operator">.</span>setVersion(<span class="number">3</span><span class="operator">,</span> <span class="number">3</span>);
          fmt<span class="operator">.</span>setProfile(<span class="type"><a href="../qtgui/qsurfaceformat.html">QSurfaceFormat</a></span><span class="operator">::</span>CoreProfile);
      } <span class="keyword">else</span> {
          <a href="../qtcore/qtglobal.html#qDebug">qDebug</a>(<span class="string">&quot;Requesting 3.0 context&quot;</span>);
          fmt<span class="operator">.</span>setVersion(<span class="number">3</span><span class="operator">,</span> <span class="number">0</span>);
      }

      <span class="type"><a href="../qtgui/qsurfaceformat.html">QSurfaceFormat</a></span><span class="operator">::</span>setDefaultFormat(fmt);

      GLWindow glWindow;
      glWindow<span class="operator">.</span>showMaximized();

      <span class="keyword">return</span> app<span class="operator">.</span>exec();
  }

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<!-- @@@hellogles3/main.cpp -->
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