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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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, Digia gives you certain additional
** rights. These rights are described in the Digia 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
//#include <GL/glew.h>
#include "glextensions.h"
#include "scene.h"
#include <QtWidgets>
#include <QGLWidget>
class GraphicsView : public QGraphicsView
{
public:
GraphicsView()
{
setWindowTitle(tr("Boxes"));
setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
//setRenderHints(QPainter::SmoothPixmapTransform);
}
protected:
void resizeEvent(QResizeEvent *event) Q_DECL_OVERRIDE {
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.");
widget->makeCurrent(); // The current context must be set before calling Scene's constructor
Scene scene(1024, 768, maxTextureSize);
GraphicsView view;
view.setViewport(widget);
view.setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
view.setScene(&scene);
view.show();
return app.exec();
}
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