Sophie

Sophie

distrib > Mandriva > current > i586 > media > main-updates > by-pkgid > 8e6051afcdb111a0317a58fb64c2abf5 > files > 215

qt4-doc-4.6.3-0.2mdv2010.2.i586.rpm

<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html
    PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
  <title>Qt 4.6: main.cpp Example File (demos/boxes/main.cpp)</title>
  <link href="classic.css" rel="stylesheet" type="text/css" />
</head>
<body>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td align="left" valign="top" width="32"><a href="http://qt.nokia.com/"><img src="images/qt-logo.png" align="left" border="0" /></a></td>
<td width="1">&nbsp;&nbsp;</td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a>&nbsp;&middot; <a href="classes.html"><font color="#004faf">All&nbsp;Classes</font></a>&nbsp;&middot; <a href="functions.html"><font color="#004faf">All&nbsp;Functions</font></a>&nbsp;&middot; <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">main.cpp Example File<br /><span class="small-subtitle">demos/boxes/main.cpp</span>
</h1>
<pre><span class="comment"> /****************************************************************************
 **
 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the demonstration applications of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** Commercial Usage
 ** Licensees holding valid Qt Commercial licenses may use this file in
 ** accordance with the Qt Commercial License Agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and Nokia.
 **
 ** GNU Lesser General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU Lesser
 ** General Public License version 2.1 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.LGPL included in the
 ** packaging of this file.  Please review the following information to
 ** ensure the GNU Lesser General Public License version 2.1 requirements
 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
 **
 ** In addition, as a special exception, Nokia gives you certain additional
 ** rights.  These rights are described in the Nokia Qt LGPL Exception
 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License version 3.0 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.GPL included in the
 ** packaging of this file.  Please review the following information to
 ** ensure the GNU General Public License version 3.0 requirements will be
 ** met: http://www.gnu.org/copyleft/gpl.html.
 **
 ** If you have questions regarding the use of this file, please contact
 ** Nokia at qt-info@nokia.com.
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/</span>

<span class="comment"> //#include &lt;GL/glew.h&gt;</span>
 #include &quot;glextensions.h&quot;

 #include &quot;scene.h&quot;

 #include &lt;QtGui&gt;
 #include &lt;QGLWidget&gt;

 class GraphicsView : public QGraphicsView
 {
 public:
     GraphicsView()
     {
         setWindowTitle(tr(&quot;Boxes&quot;));
         setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
         <span class="comment">//setRenderHints(QPainter::SmoothPixmapTransform);</span>
     }

 protected:
     void resizeEvent(QResizeEvent *event) {
         if (scene())
             scene()-&gt;setSceneRect(QRect(QPoint(0, 0), event-&gt;size()));
         QGraphicsView::resizeEvent(event);
     }
 };

 inline bool matchString(const char *extensionString, const char *subString)
 {
     int subStringLength = strlen(subString);
     return (strncmp(extensionString, subString, subStringLength) == 0)
         &amp;&amp; ((extensionString[subStringLength] == ' ') || (extensionString[subStringLength] == '\0'));
 }

 bool necessaryExtensionsSupported()
 {
     const char *extensionString = reinterpret_cast&lt;const char *&gt;(glGetString(GL_EXTENSIONS));
     const char *p = extensionString;

     const int GL_EXT_FBO = 1;
     const int GL_ARB_VS = 2;
     const int GL_ARB_FS = 4;
     const int GL_ARB_SO = 8;
     int extensions = 0;

     while (*p) {
         if (matchString(p, &quot;GL_EXT_framebuffer_object&quot;))
             extensions |= GL_EXT_FBO;
         else if (matchString(p, &quot;GL_ARB_vertex_shader&quot;))
             extensions |= GL_ARB_VS;
         else if (matchString(p, &quot;GL_ARB_fragment_shader&quot;))
             extensions |= GL_ARB_FS;
         else if (matchString(p, &quot;GL_ARB_shader_objects&quot;))
             extensions |= GL_ARB_SO;
         while ((*p != ' ') &amp;&amp; (*p != '\0'))
             ++p;
         if (*p == ' ')
             ++p;
     }
     return (extensions == 15);
 }

 int main(int argc, char **argv)
 {
     QApplication app(argc, argv);

     if ((QGLFormat::openGLVersionFlags() &amp; QGLFormat::OpenGL_Version_1_5) == 0) {
         QMessageBox::critical(0, &quot;OpenGL features missing&quot;,
             &quot;OpenGL version 1.5 or higher is required to run this demo.\n&quot;
             &quot;The program will now exit.&quot;);
         return -1;
     }

     int maxTextureSize = 1024;
     QGLWidget *widget = new QGLWidget(QGLFormat(QGL::SampleBuffers));
     widget-&gt;makeCurrent();

     if (!necessaryExtensionsSupported()) {
         QMessageBox::critical(0, &quot;OpenGL features missing&quot;,
             &quot;The OpenGL extensions required to run this demo are missing.\n&quot;
             &quot;The program will now exit.&quot;);
         delete widget;
         return -2;
     }

     <span class="comment">// Check if all the necessary functions are resolved.</span>
     if (!getGLExtensionFunctions().resolve(widget-&gt;context())) {
         QMessageBox::critical(0, &quot;OpenGL features missing&quot;,
             &quot;Failed to resolve OpenGL functions required to run this demo.\n&quot;
             &quot;The program will now exit.&quot;);
         delete widget;
         return -3;
     }

     <span class="comment">// TODO: Make conditional for final release</span>
     QMessageBox::information(0, &quot;For your information&quot;,
         &quot;This demo can be GPU and CPU intensive and may\n&quot;
         &quot;work poorly or not at all on your system.&quot;);

     widget-&gt;makeCurrent(); <span class="comment">// The current context must be set before calling Scene's constructor</span>
     Scene scene(1024, 768, maxTextureSize);
     GraphicsView view;
     view.setViewport(widget);
     view.setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
     view.setScene(&amp;scene);
     view.show();

     return app.exec();
 }</pre>
<p /><address><hr /><div align="center">
<table width="100%" cellspacing="0" border="0"><tr class="address">
<td width="40%" align="left">Copyright &copy; 2010 Nokia Corporation and/or its subsidiary(-ies)</td>
<td width="20%" align="center"><a href="trademarks.html">Trademarks</a></td>
<td width="40%" align="right"><div align="right">Qt 4.6.3</div></td>
</tr></table></div></address></body>
</html>