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/****************************************************************************
**
** Copyright (C) 2017 Crimson AS <info@crimson.no>
** Contact: https://www.qt.io/licensing/
**
** This file is part of the qmlbench tool.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <iostream>
#include <iomanip>
#include <QtCore>
#include <QtGui>
class FpsDecider : public QWindow
{
public:
FpsDecider()
: gl(0)
, frameCount(0)
{
setSurfaceType(OpenGLSurface);
QSurfaceFormat format;
#if QT_VERSION >= 0x050300
format.setSwapInterval(1);
#endif
setFormat(format);
}
void exposeEvent(QExposeEvent *) override {
if (isExposed())
render();
}
bool event(QEvent *e) override
{
if (e->type() == QEvent::UpdateRequest) {
render();
return true;
}
return QWindow::event(e);
}
void render()
{
if (!gl) {
gl = new QOpenGLContext();
gl->setFormat(format());
gl->create();
timer.start();
}
gl->makeCurrent(this);
QOpenGLFunctions *func = gl->functions();
if (frameCount == 0) {
#if QT_VERSION >= 0x050300
std::cout << "GL_VENDOR: " << (const char *) func->glGetString(GL_VENDOR) << std::endl;
std::cout << "GL_RENDERER: " << (const char *) func->glGetString(GL_RENDERER) << std::endl;
std::cout << "GL_VERSION: " << (const char *) func->glGetString(GL_VERSION) << std::endl;
#else
Q_UNUSED(func);
std::cout << "GL_VENDOR: " << (const char *) glGetString(GL_VENDOR) << std::endl;
std::cout << "GL_RENDERER: " << (const char *) glGetString(GL_RENDERER) << std::endl;
std::cout << "GL_VERSION: " << (const char *) glGetString(GL_VERSION) << std::endl;
#endif
}
++frameCount;
int c = frameCount % 2;
#if QT_VERSION >= 0x050300
func->glClearColor(c, 0, 1 - c, 1);
func->glClear(GL_COLOR_BUFFER_BIT);
#else
glClearColor(c, 0, 1 - c, 1);
glClear(GL_COLOR_BUFFER_BIT);
#endif
gl->swapBuffers(this);
int time = timer.elapsed();
if (time > 5000) {
qreal msPerFrame = time / float(frameCount);
qreal screenRate = 1000.0 / screen()->refreshRate();
std::cout << std::endl
<< "FPS: " << frameCount * 1000 / float(time)
<< " -- " << frameCount << " frames in " << time << "ms; "
<< msPerFrame << " ms/frame"
<< "; QScreen says: " << screenRate << std::endl;
if (qAbs(screenRate - msPerFrame) > msPerFrame * 0.1)
std::cout << " (not accurate, run benchmarks with '--fps-override " << int(1000/msPerFrame) << "')" << std::endl << std::endl;
else
std::cout << std::endl << "That should be close enough :)" << std::endl << std::endl;
exit(0);
} else {
QCoreApplication::postEvent(this, new QEvent(QEvent::UpdateRequest));
}
}
private:
QOpenGLContext *gl;
QElapsedTimer timer;
int frameCount;
};
int main(int argc, char **argv)
{
QGuiApplication app(argc, argv);
FpsDecider fpsDecider;
if (app.arguments().contains("--fullscreen"))
fpsDecider.showFullScreen();
else
fpsDecider.show();
fpsDecider.raise();
return app.exec();
}
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