Add a multiwindow manual test using QOpenGLWindow
This is a very useful tool to test the behavior of a given platform when it comes to rendering on three contexts to three window surfaces from the gui thread and calling swapBuffers for each. Change-Id: If3abd055d0dee7cfb24098484326aa24261556bc Reviewed-by: Gunnar Sletta <gunnar@sletta.org>
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Laszlo Agocs
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tests/manual/qopenglwindow/multiwindow/main.cpp
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tests/manual/qopenglwindow/multiwindow/main.cpp
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/****************************************************************************
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**
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** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the test suite of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QGuiApplication>
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#include <QOpenGLWindow>
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#include <QOpenGLContext>
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#include <QOpenGLFunctions>
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#include <QPainter>
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#include <QElapsedTimer>
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// This application opens three windows and continuously schedules updates for
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// them. Each of them is a separate QOpenGLWindow so there will be a separate
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// context and swapBuffers call for each.
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//
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// By default the swap interval is 1 so the effect of three blocking swapBuffers
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// on the main thread can be examined. (the result is likely to be different
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// between platforms, for example OS X is buffer queuing meaning that it can
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// block outside swap, resulting in perfect vsync for all three windows, while
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// other systems that block on swap will kill the frame rate due to blocking the
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// thread three times)
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//
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// Pass --novsync to set a swap interval of 0. This should give an unthrottled
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// refresh on all platforms for all three windows.
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//
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// Passing --vsyncone sets swap interval to 1 for the first window and 0 to the
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// others.
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//
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// Pass --extrawindows N to open N windows in addition to the default 3.
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//
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// For reference, below is a table of some test results.
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//
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// swap interval 1 for all swap interval 1 for only one and 0 for others
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// --------------------------------------------------------------------------------------------------------------------
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// OS X (Intel HD) 60 FPS for all 60 FPS for all
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// Windows Intel opengl32 20 FPS for all (each swap blocks) 60 FPS for all
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// Windows ANGLE D3D9/D3D11 60 FPS for all 60 FPS for all
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// Windows ANGLE D3D11 WARP 20 FPS for all 60 FPS for all
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// Windows Mesa llvmpipe does not really vsync anyway
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class Window : public QOpenGLWindow
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{
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public:
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Window(int n) : idx(n) {
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r = g = b = fps = 0;
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y = 0;
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resize(200, 200);
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t2.start();
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}
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void paintGL() {
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QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
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f->glClearColor(r, g, b, 1);
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f->glClear(GL_COLOR_BUFFER_BIT);
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switch (idx % 3) {
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case 0:
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r += 0.005f;
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break;
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case 1:
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g += 0.005f;
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break;
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case 2:
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b += 0.005f;
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break;
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}
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if (r > 1)
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r = 0;
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if (g > 1)
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g = 0;
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if (b > 1)
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b = 0;
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QPainter p(this);
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p.setPen(Qt::white);
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p.drawText(QPoint(20, y), QString(QLatin1String("Window %1 (%2 FPS)")).arg(idx).arg(fps));
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y += 1;
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if (y > height() - 20)
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y = 20;
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if (t2.elapsed() > 1000) {
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fps = 1000.0 / t.elapsed();
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t2.restart();
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}
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t.restart();
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update();
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}
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private:
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int idx;
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GLfloat r, g, b, fps;
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int y;
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QElapsedTimer t, t2;
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};
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int main(int argc, char **argv)
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{
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QGuiApplication app(argc, argv);
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QSurfaceFormat fmt;
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if (QGuiApplication::arguments().contains(QLatin1String("--novsync"))) {
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qDebug("swap interval 0 (no throttling)");
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fmt.setSwapInterval(0);
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} else {
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qDebug("swap interval 1 (sync to vblank)");
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}
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QSurfaceFormat::setDefaultFormat(fmt);
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Window w1(0);
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if (QGuiApplication::arguments().contains(QLatin1String("--vsyncone"))) {
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qDebug("swap interval 1 for first window only");
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QSurfaceFormat w1fmt = fmt;
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w1fmt.setSwapInterval(1);
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w1.setFormat(w1fmt);
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fmt.setSwapInterval(0);
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QSurfaceFormat::setDefaultFormat(fmt);
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}
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Window w2(1);
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Window w3(2);
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w1.setGeometry(QRect(QPoint(10, 100), w1.size()));
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w2.setGeometry(QRect(QPoint(300, 100), w2.size()));
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w3.setGeometry(QRect(QPoint(600, 100), w3.size()));
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w1.show();
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w2.show();
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w3.show();
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QList<QWindow *> extraWindows;
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int countIdx;
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if ((countIdx = QGuiApplication::arguments().indexOf(QLatin1String("--extrawindows"))) >= 0) {
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int extraWindowCount = QGuiApplication::arguments().at(countIdx + 1).toInt();
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for (int i = 0; i < extraWindowCount; ++i) {
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Window *w = new Window(3 + i);
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extraWindows << w;
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w->show();
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}
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}
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int r = app.exec();
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qDeleteAll(extraWindows);
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return r;
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}
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4
tests/manual/qopenglwindow/multiwindow/multiwindow.pro
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4
tests/manual/qopenglwindow/multiwindow/multiwindow.pro
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@ -0,0 +1,4 @@
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TEMPLATE = app
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TARGET = multiwindow
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SOURCES += main.cpp
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