| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the test suite of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:GPL-EXCEPT$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
| ** accordance with the commercial license agreement provided with the |
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| ** |
| ** 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 <QtGui> |
| |
| const char applicationDescription[] = "\n\ |
| This application opens multiple windows and continuously schedules updates for\n\ |
| them. Each of them is a separate QOpenGLWindow so there will be a separate\n\ |
| context and swapBuffers call for each.\n\ |
| \n\ |
| By default the swap interval is 1 so the effect of multiple blocking swapBuffers\n\ |
| on the main thread can be examined. (the result is likely to be different\n\ |
| between platforms, for example OS X is buffer queuing meaning that it can\n\ |
| block outside swap, resulting in perfect vsync for all three windows, while\n\ |
| other systems that block on swap will kill the frame rate due to blocking the\n\ |
| thread three times)\ |
| "; |
| |
| // For reference, below is a table of some test results. |
| // |
| // swap interval 1 for all swap interval 1 for only one and 0 for others |
| // -------------------------------------------------------------------------------------------------------------------- |
| // OS X (Intel HD) 60 FPS for all 60 FPS for all |
| // Windows Intel opengl32 20 FPS for all (each swap blocks) 60 FPS for all |
| // Windows ANGLE D3D9/D3D11 60 FPS for all 60 FPS for all |
| // Windows ANGLE D3D11 WARP 20 FPS for all 60 FPS for all |
| // Windows Mesa llvmpipe does not really vsync anyway |
| |
| class Window : public QOpenGLWindow |
| { |
| Q_OBJECT |
| public: |
| Window(int index) : windowNumber(index + 1), x(0), framesSwapped(0) { |
| |
| color = QColor::fromHsl((index * 30) % 360, 255, 127).toRgb(); |
| |
| resize(200, 200); |
| |
| setObjectName(QString("Window %1").arg(windowNumber)); |
| |
| connect(this, SIGNAL(frameSwapped()), SLOT(frameSwapped())); |
| } |
| |
| void paintGL() { |
| QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions(); |
| f->glClearColor(color.redF(), color.greenF(), color.blueF(), 1); |
| f->glClear(GL_COLOR_BUFFER_BIT); |
| |
| QPainter painter(this); |
| painter.drawLine(x, 0, x, height()); |
| x = ++x % width(); |
| } |
| |
| public slots: |
| void frameSwapped() { |
| ++framesSwapped; |
| update(); |
| } |
| |
| protected: |
| void exposeEvent(QExposeEvent *event) { |
| if (!isExposed()) |
| return; |
| |
| QSurfaceFormat format = context()->format(); |
| qDebug() << this << format.swapBehavior() << "with Vsync =" << (format.swapInterval() ? "ON" : "OFF"); |
| if (format.swapInterval() != requestedFormat().swapInterval()) |
| qWarning() << "WARNING: Did not get requested swap interval of" << requestedFormat().swapInterval() << "for" << this; |
| |
| QOpenGLWindow::exposeEvent(event); |
| } |
| |
| void mousePressEvent(QMouseEvent *event) { |
| qDebug() << this << event; |
| color.setHsl((color.hue() + 90) % 360, color.saturation(), color.lightness()); |
| color = color.toRgb(); |
| } |
| |
| private: |
| int windowNumber; |
| QColor color; |
| int x; |
| |
| int framesSwapped; |
| friend void printFps(); |
| }; |
| |
| static const qreal kFpsInterval = 500; |
| |
| void printFps() |
| { |
| static QElapsedTimer timer; |
| if (!timer.isValid()) { |
| timer.start(); |
| return; |
| } |
| |
| const qreal frameFactor = (kFpsInterval / timer.elapsed()) * (1000.0 / kFpsInterval); |
| |
| QDebug output = qDebug().nospace(); |
| |
| qreal averageFps = 0; |
| const QWindowList windows = QGuiApplication::topLevelWindows(); |
| for (int i = 0; i < windows.size(); ++i) { |
| Window *w = qobject_cast<Window*>(windows.at(i)); |
| Q_ASSERT(w); |
| |
| int fps = qRound(w->framesSwapped * frameFactor); |
| output << (i + 1) << "=" << fps << ", "; |
| |
| averageFps += fps; |
| w->framesSwapped = 0; |
| } |
| averageFps = qRound(averageFps / windows.size()); |
| qreal msPerFrame = 1000.0 / averageFps; |
| |
| output << "avg=" << averageFps << ", ms=" << msPerFrame; |
| |
| timer.restart(); |
| } |
| |
| int main(int argc, char **argv) |
| { |
| QGuiApplication app(argc, argv); |
| |
| QCommandLineParser parser; |
| parser.setApplicationDescription(applicationDescription); |
| parser.addHelpOption(); |
| |
| QCommandLineOption noVsyncOption("novsync", "Disable Vsync by setting swap interval to 0. " |
| "This should give an unthrottled refresh on all platforms for all windows."); |
| parser.addOption(noVsyncOption); |
| |
| QCommandLineOption vsyncOneOption("vsyncone", "Enable Vsync only for first window, " |
| "by setting swap interval to 1 for the first window and 0 for the others."); |
| parser.addOption(vsyncOneOption); |
| |
| QCommandLineOption numWindowsOption("numwindows", "Open <N> windows instead of the default 3.", "N", "3"); |
| parser.addOption(numWindowsOption); |
| |
| parser.process(app); |
| |
| QSurfaceFormat defaultSurfaceFormat; |
| defaultSurfaceFormat.setSwapInterval(parser.isSet(noVsyncOption) ? 0 : 1); |
| QSurfaceFormat::setDefaultFormat(defaultSurfaceFormat); |
| |
| QRect availableGeometry = app.primaryScreen()->availableGeometry(); |
| |
| int numberOfWindows = qMax(parser.value(numWindowsOption).toInt(), 1); |
| QList<QWindow *> windows; |
| for (int i = 0; i < numberOfWindows; ++i) { |
| Window *w = new Window(i); |
| windows << w; |
| |
| if (i == 0 && parser.isSet(vsyncOneOption)) { |
| QSurfaceFormat vsyncedSurfaceFormat = defaultSurfaceFormat; |
| vsyncedSurfaceFormat.setSwapInterval(1); |
| w->setFormat(vsyncedSurfaceFormat); |
| defaultSurfaceFormat.setSwapInterval(0); |
| QSurfaceFormat::setDefaultFormat(defaultSurfaceFormat); |
| } |
| |
| static int windowWidth = w->width() + 20; |
| static int windowHeight = w->height() + 20; |
| |
| static int windowsPerRow = availableGeometry.width() / windowWidth; |
| |
| int col = i; |
| int row = col / windowsPerRow; |
| col -= row * windowsPerRow; |
| |
| QPoint position = availableGeometry.topLeft(); |
| position += QPoint(col * windowWidth, row * windowHeight); |
| w->setFramePosition(position); |
| w->showNormal(); |
| } |
| |
| QTimer fpsTimer; |
| fpsTimer.setInterval(kFpsInterval); |
| fpsTimer.setTimerType(Qt::PreciseTimer); |
| QObject::connect(&fpsTimer, &QTimer::timeout, &printFps); |
| fpsTimer.start(); |
| |
| int r = app.exec(); |
| qDeleteAll(windows); |
| return r; |
| } |
| |
| #include "main.moc" |