<?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"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="functions.html"><font color="#004faf">All Functions</font></a> · <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 <GL/glew.h></span> #include "glextensions.h" #include "scene.h" #include <QtGui> #include <QGLWidget> class GraphicsView : public QGraphicsView { public: GraphicsView() { setWindowTitle(tr("Boxes")); setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform); <span class="comment">//setRenderHints(QPainter::SmoothPixmapTransform);</span> } protected: void resizeEvent(QResizeEvent *event) { if (scene()) scene()->setSceneRect(QRect(QPoint(0, 0), event->size())); QGraphicsView::resizeEvent(event); } }; inline bool matchString(const char *extensionString, const char *subString) { int subStringLength = strlen(subString); return (strncmp(extensionString, subString, subStringLength) == 0) && ((extensionString[subStringLength] == ' ') || (extensionString[subStringLength] == '\0')); } bool necessaryExtensionsSupported() { const char *extensionString = reinterpret_cast<const char *>(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, "GL_EXT_framebuffer_object")) extensions |= GL_EXT_FBO; else if (matchString(p, "GL_ARB_vertex_shader")) extensions |= GL_ARB_VS; else if (matchString(p, "GL_ARB_fragment_shader")) extensions |= GL_ARB_FS; else if (matchString(p, "GL_ARB_shader_objects")) extensions |= GL_ARB_SO; while ((*p != ' ') && (*p != '\0')) ++p; if (*p == ' ') ++p; } return (extensions == 15); } int main(int argc, char **argv) { QApplication app(argc, argv); if ((QGLFormat::openGLVersionFlags() & QGLFormat::OpenGL_Version_1_5) == 0) { QMessageBox::critical(0, "OpenGL features missing", "OpenGL version 1.5 or higher is required to run this demo.\n" "The program will now exit."); return -1; } int maxTextureSize = 1024; QGLWidget *widget = new QGLWidget(QGLFormat(QGL::SampleBuffers)); widget->makeCurrent(); if (!necessaryExtensionsSupported()) { QMessageBox::critical(0, "OpenGL features missing", "The OpenGL extensions required to run this demo are missing.\n" "The program will now exit."); delete widget; return -2; } <span class="comment">// Check if all the necessary functions are resolved.</span> if (!getGLExtensionFunctions().resolve(widget->context())) { QMessageBox::critical(0, "OpenGL features missing", "Failed to resolve OpenGL functions required to run this demo.\n" "The program will now exit."); delete widget; return -3; } <span class="comment">// TODO: Make conditional for final release</span> QMessageBox::information(0, "For your information", "This demo can be GPU and CPU intensive and may\n" "work poorly or not at all on your system."); widget->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(&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 © 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>