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authorLars Knoll <lars.knoll@nokia.com>2009-03-23 09:18:55 (GMT)
committerSimon Hausmann <simon.hausmann@nokia.com>2009-03-23 09:18:55 (GMT)
commite5fcad302d86d316390c6b0f62759a067313e8a9 (patch)
treec2afbf6f1066b6ce261f14341cf6d310e5595bc1 /demos/boxes/main.cpp
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Long live Qt 4.5!
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, 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 are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//#include <GL/glew.h>
+#include "glextensions.h"
+
+#include "scene.h"
+
+#include <QtGui>
+#include <QGLWidget>
+
+class GraphicsView : public QGraphicsView
+{
+public:
+ GraphicsView()
+ {
+ setWindowTitle(tr("Boxes"));
+ setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
+ //setRenderHints(QPainter::SmoothPixmapTransform);
+ }
+
+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;
+ }
+
+ // Check if all the necessary functions are resolved.
+ 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;
+ }
+
+ // TODO: Make conditional for final release
+ 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.");
+
+ GraphicsView view;
+ view.setViewport(widget);
+ view.setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
+ widget->makeCurrent(); // The current context must be set before calling Scene's constructor
+ view.setScene(new Scene(1024, 768, maxTextureSize));
+ view.show();
+
+ return app.exec();
+}
+