645 lines
19 KiB
C++
645 lines
19 KiB
C++
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/****************************************************************************
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**
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** Copyright (C) 2018 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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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 The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QApplication>
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#include <QWidget>
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#include <QLabel>
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#include <QPlainTextEdit>
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#include <QPushButton>
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#include <QCheckBox>
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#include <QVBoxLayout>
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#include <QCommandLineParser>
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#include <QWindow>
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#include <QPlatformSurfaceEvent>
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#include <QElapsedTimer>
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#include <QtGui/private/qshader_p.h>
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#include <QFile>
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#ifndef QT_NO_OPENGL
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#include <QtGui/private/qrhigles2_p.h>
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#include <QOffscreenSurface>
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#endif
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#if QT_CONFIG(vulkan)
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#include <QLoggingCategory>
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#include <QtGui/private/qrhivulkan_p.h>
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#endif
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#ifdef Q_OS_WIN
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#include <QtGui/private/qrhid3d11_p.h>
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#endif
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#ifdef Q_OS_DARWIN
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#include <QtGui/private/qrhimetal_p.h>
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#endif
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enum GraphicsApi
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{
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OpenGL,
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Vulkan,
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D3D11,
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Metal
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};
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static GraphicsApi graphicsApi;
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static QString graphicsApiName()
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{
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switch (graphicsApi) {
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case OpenGL:
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return QLatin1String("OpenGL 2.x");
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case Vulkan:
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return QLatin1String("Vulkan");
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case D3D11:
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return QLatin1String("Direct3D 11");
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case Metal:
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return QLatin1String("Metal");
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default:
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break;
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}
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return QString();
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}
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static struct {
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#if QT_CONFIG(vulkan)
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QVulkanInstance *instance = nullptr;
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#endif
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QRhi *r = nullptr;
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#ifndef QT_NO_OPENGL
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QOffscreenSurface *fallbackSurface = nullptr;
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#endif
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} r;
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void createRhi()
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{
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#ifndef QT_NO_OPENGL
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if (graphicsApi == OpenGL) {
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r.fallbackSurface = QRhiGles2InitParams::newFallbackSurface();
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QRhiGles2InitParams params;
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params.fallbackSurface = r.fallbackSurface;
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//params.window = this;
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r.r = QRhi::create(QRhi::OpenGLES2, ¶ms);
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}
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#endif
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#if QT_CONFIG(vulkan)
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if (graphicsApi == Vulkan) {
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QRhiVulkanInitParams params;
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params.inst = r.instance;
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//params.window = this;
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r.r = QRhi::create(QRhi::Vulkan, ¶ms);
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}
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#endif
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#ifdef Q_OS_WIN
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if (graphicsApi == D3D11) {
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QRhiD3D11InitParams params;
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params.enableDebugLayer = true;
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r.r = QRhi::create(QRhi::D3D11, ¶ms);
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}
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#endif
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#ifdef Q_OS_DARWIN
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if (graphicsApi == Metal) {
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QRhiMetalInitParams params;
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r.r = QRhi::create(QRhi::Metal, ¶ms);
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}
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#endif
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if (!r.r)
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qFatal("Failed to create RHI backend");
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}
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void destroyRhi()
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{
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delete r.r;
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#ifndef QT_NO_OPENGL
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delete r.fallbackSurface;
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#endif
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}
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struct {
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QVector<QWindow *> windows;
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QRhiBuffer *vbuf = nullptr;
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QRhiBuffer *ubuf = nullptr;
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QRhiShaderResourceBindings *srb = nullptr;
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QRhiGraphicsPipeline *ps = nullptr;
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QRhiResourceUpdateBatch *initialUpdates = nullptr;
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} d;
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static float vertexData[] = {
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0.0f, 0.5f, 1.0f, 0.0f, 0.0f,
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-0.5f, -0.5f, 0.0f, 1.0f, 0.0f,
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0.5f, -0.5f, 0.0f, 0.0f, 1.0f,
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};
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static QShader getShader(const QString &name)
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{
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QFile f(name);
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if (f.open(QIODevice::ReadOnly))
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return QShader::fromSerialized(f.readAll());
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return QShader();
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}
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// can use just one rpd from whichever window comes first since they are
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// actually compatible due to all windows using the same config (have
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// depth-stencil, sample count 1, same format). this means the same pso can be
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// reused too.
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void ensureSharedResources(QRhiRenderPassDescriptor *rp)
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{
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if (!d.vbuf) {
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d.vbuf = r.r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(vertexData));
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d.vbuf->build();
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d.initialUpdates = r.r->nextResourceUpdateBatch();
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d.initialUpdates->uploadStaticBuffer(d.vbuf, vertexData);
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}
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if (!d.ubuf) {
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d.ubuf = r.r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 68);
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d.ubuf->build();
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}
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if (!d.srb) {
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d.srb = r.r->newShaderResourceBindings();
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d.srb->setBindings({
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QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage, d.ubuf)
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});
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d.srb->build();
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}
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if (!d.ps) {
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d.ps = r.r->newGraphicsPipeline();
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QRhiGraphicsPipeline::TargetBlend premulAlphaBlend;
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premulAlphaBlend.enable = true;
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d.ps->setTargetBlends({ premulAlphaBlend });
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const QShader vs = getShader(QLatin1String(":/color.vert.qsb"));
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if (!vs.isValid())
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qFatal("Failed to load shader pack (vertex)");
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const QShader fs = getShader(QLatin1String(":/color.frag.qsb"));
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if (!fs.isValid())
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qFatal("Failed to load shader pack (fragment)");
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d.ps->setShaderStages({
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{ QRhiGraphicsShaderStage::Vertex, vs },
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{ QRhiGraphicsShaderStage::Fragment, fs }
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});
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QRhiVertexInputLayout inputLayout;
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inputLayout.setBindings({
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{ 5 * sizeof(float) }
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});
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inputLayout.setAttributes({
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{ 0, 0, QRhiVertexInputAttribute::Float2, 0 },
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{ 0, 1, QRhiVertexInputAttribute::Float3, 2 * sizeof(float) }
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});
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d.ps->setVertexInputLayout(inputLayout);
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d.ps->setShaderResourceBindings(d.srb);
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d.ps->setRenderPassDescriptor(rp);
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d.ps->build();
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}
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}
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void destroySharedResources()
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{
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delete d.ps;
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d.ps = nullptr;
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delete d.srb;
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d.srb = nullptr;
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delete d.vbuf;
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d.vbuf = nullptr;
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delete d.ubuf;
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d.ubuf = nullptr;
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}
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class Window : public QWindow
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{
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public:
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Window(const QString &title, const QColor &bgColor, int axis, bool noVSync);
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~Window();
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protected:
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void init();
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void releaseResources();
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void resizeSwapChain();
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void releaseSwapChain();
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void render();
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void exposeEvent(QExposeEvent *) override;
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bool event(QEvent *) override;
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QColor m_bgColor;
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int m_rotationAxis;
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bool m_noVSync;
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bool m_running = false;
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bool m_notExposed = false;
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bool m_newlyExposed = false;
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QMatrix4x4 m_proj;
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QVector<QRhiResource *> m_releasePool;
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bool m_hasSwapChain = false;
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QRhiSwapChain *m_sc = nullptr;
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QRhiRenderBuffer *m_ds = nullptr;
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QRhiRenderPassDescriptor *m_rp = nullptr;
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float m_rotation = 0;
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float m_opacity = 1;
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int m_opacityDir = -1;
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};
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Window::Window(const QString &title, const QColor &bgColor, int axis, bool noVSync)
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: m_bgColor(bgColor),
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m_rotationAxis(axis),
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m_noVSync(noVSync)
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{
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switch (graphicsApi) {
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case OpenGL:
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{
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#if QT_CONFIG(opengl)
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setSurfaceType(OpenGLSurface);
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QSurfaceFormat fmt = QRhiGles2InitParams::adjustedFormat(); // default + depth/stencil
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fmt.setSwapInterval(noVSync ? 0 : 1); // + swap interval
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setFormat(fmt);
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#endif
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}
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break;
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case Vulkan:
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#if QT_CONFIG(vulkan)
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setSurfaceType(VulkanSurface);
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setVulkanInstance(r.instance);
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#endif
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break;
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case D3D11:
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setSurfaceType(OpenGLSurface); // not a typo
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break;
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case Metal:
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#if (QT_VERSION >= QT_VERSION_CHECK(5, 12, 0))
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setSurfaceType(MetalSurface);
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#endif
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break;
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default:
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break;
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}
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resize(800, 600);
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setTitle(title);
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}
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Window::~Window()
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{
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releaseResources();
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}
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void Window::exposeEvent(QExposeEvent *)
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{
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// initialize and start rendering when the window becomes usable for graphics purposes
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if (isExposed() && !m_running) {
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m_running = true;
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init();
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resizeSwapChain();
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}
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// stop pushing frames when not exposed (or size is 0)
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if ((!isExposed() || (m_hasSwapChain && m_sc->surfacePixelSize().isEmpty())) && m_running)
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m_notExposed = true;
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// continue when exposed again and the surface has a valid size.
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// note that the surface size can be (0, 0) even though size() reports a valid one...
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if (isExposed() && m_running && m_notExposed && !m_sc->surfacePixelSize().isEmpty()) {
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m_notExposed = false;
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m_newlyExposed = true;
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}
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// always render a frame on exposeEvent() (when exposed) in order to update
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// immediately on window resize.
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if (isExposed() && !m_sc->surfacePixelSize().isEmpty())
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render();
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}
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bool Window::event(QEvent *e)
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{
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switch (e->type()) {
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case QEvent::UpdateRequest:
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render();
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break;
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case QEvent::PlatformSurface:
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// this is the proper time to tear down the swapchain (while the native window and surface are still around)
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if (static_cast<QPlatformSurfaceEvent *>(e)->surfaceEventType() == QPlatformSurfaceEvent::SurfaceAboutToBeDestroyed)
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releaseSwapChain();
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break;
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default:
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|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return QWindow::event(e);
|
||
|
|
}
|
||
|
|
|
||
|
|
void Window::init()
|
||
|
|
{
|
||
|
|
m_sc = r.r->newSwapChain();
|
||
|
|
m_ds = r.r->newRenderBuffer(QRhiRenderBuffer::DepthStencil,
|
||
|
|
QSize(), // no need to set the size yet
|
||
|
|
1,
|
||
|
|
QRhiRenderBuffer::UsedWithSwapChainOnly);
|
||
|
|
m_releasePool << m_ds;
|
||
|
|
m_sc->setWindow(this);
|
||
|
|
m_sc->setDepthStencil(m_ds);
|
||
|
|
if (m_noVSync)
|
||
|
|
m_sc->setFlags(QRhiSwapChain::NoVSync);
|
||
|
|
|
||
|
|
m_rp = m_sc->newCompatibleRenderPassDescriptor();
|
||
|
|
m_releasePool << m_rp;
|
||
|
|
m_sc->setRenderPassDescriptor(m_rp);
|
||
|
|
|
||
|
|
ensureSharedResources(m_rp);
|
||
|
|
}
|
||
|
|
|
||
|
|
void Window::releaseResources()
|
||
|
|
{
|
||
|
|
qDeleteAll(m_releasePool);
|
||
|
|
m_releasePool.clear();
|
||
|
|
|
||
|
|
delete m_sc;
|
||
|
|
m_sc = nullptr;
|
||
|
|
}
|
||
|
|
|
||
|
|
void Window::resizeSwapChain()
|
||
|
|
{
|
||
|
|
const QSize outputSize = m_sc->surfacePixelSize();
|
||
|
|
|
||
|
|
m_ds->setPixelSize(outputSize);
|
||
|
|
m_ds->build();
|
||
|
|
|
||
|
|
m_hasSwapChain = m_sc->buildOrResize();
|
||
|
|
|
||
|
|
m_proj = r.r->clipSpaceCorrMatrix();
|
||
|
|
m_proj.perspective(45.0f, outputSize.width() / (float) outputSize.height(), 0.01f, 1000.0f);
|
||
|
|
m_proj.translate(0, 0, -4);
|
||
|
|
}
|
||
|
|
|
||
|
|
void Window::releaseSwapChain()
|
||
|
|
{
|
||
|
|
if (m_hasSwapChain) {
|
||
|
|
m_hasSwapChain = false;
|
||
|
|
m_sc->release();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void Window::render()
|
||
|
|
{
|
||
|
|
if (!m_hasSwapChain || m_notExposed)
|
||
|
|
return;
|
||
|
|
|
||
|
|
// If the window got resized or got newly exposed, resize the swapchain.
|
||
|
|
// (the newly-exposed case is not actually required by some
|
||
|
|
// platforms/backends, but f.ex. Vulkan on Windows seems to need it)
|
||
|
|
if (m_sc->currentPixelSize() != m_sc->surfacePixelSize() || m_newlyExposed) {
|
||
|
|
resizeSwapChain();
|
||
|
|
if (!m_hasSwapChain)
|
||
|
|
return;
|
||
|
|
m_newlyExposed = false;
|
||
|
|
}
|
||
|
|
|
||
|
|
QRhi::FrameOpResult result = r.r->beginFrame(m_sc);
|
||
|
|
if (result == QRhi::FrameOpSwapChainOutOfDate) {
|
||
|
|
resizeSwapChain();
|
||
|
|
if (!m_hasSwapChain)
|
||
|
|
return;
|
||
|
|
result = r.r->beginFrame(m_sc);
|
||
|
|
}
|
||
|
|
if (result != QRhi::FrameOpSuccess) {
|
||
|
|
requestUpdate();
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
QRhiCommandBuffer *cb = m_sc->currentFrameCommandBuffer();
|
||
|
|
const QSize outputSizeInPixels = m_sc->currentPixelSize();
|
||
|
|
|
||
|
|
QRhiResourceUpdateBatch *u = r.r->nextResourceUpdateBatch();
|
||
|
|
if (d.initialUpdates) {
|
||
|
|
u->merge(d.initialUpdates);
|
||
|
|
d.initialUpdates->release();
|
||
|
|
d.initialUpdates = nullptr;
|
||
|
|
}
|
||
|
|
|
||
|
|
m_rotation += 1.0f;
|
||
|
|
QMatrix4x4 mvp = m_proj;
|
||
|
|
mvp.rotate(m_rotation, m_rotationAxis == 0 ? 1 : 0, m_rotationAxis == 1 ? 1 : 0, m_rotationAxis == 2 ? 1 : 0);
|
||
|
|
u->updateDynamicBuffer(d.ubuf, 0, 64, mvp.constData());
|
||
|
|
m_opacity += m_opacityDir * 0.005f;
|
||
|
|
if (m_opacity < 0.0f || m_opacity > 1.0f) {
|
||
|
|
m_opacityDir *= -1;
|
||
|
|
m_opacity = qBound(0.0f, m_opacity, 1.0f);
|
||
|
|
}
|
||
|
|
u->updateDynamicBuffer(d.ubuf, 64, 4, &m_opacity);
|
||
|
|
|
||
|
|
cb->beginPass(m_sc->currentFrameRenderTarget(),
|
||
|
|
QColor::fromRgbF(float(m_bgColor.redF()), float(m_bgColor.greenF()), float(m_bgColor.blueF()), 1.0f),
|
||
|
|
{ 1.0f, 0 },
|
||
|
|
u);
|
||
|
|
|
||
|
|
cb->setGraphicsPipeline(d.ps);
|
||
|
|
cb->setViewport({ 0, 0, float(outputSizeInPixels.width()), float(outputSizeInPixels.height()) });
|
||
|
|
cb->setShaderResources();
|
||
|
|
const QRhiCommandBuffer::VertexInput vbufBinding(d.vbuf, 0);
|
||
|
|
cb->setVertexInput(0, 1, &vbufBinding);
|
||
|
|
cb->draw(3);
|
||
|
|
|
||
|
|
cb->endPass();
|
||
|
|
|
||
|
|
r.r->endFrame(m_sc);
|
||
|
|
|
||
|
|
requestUpdate();
|
||
|
|
}
|
||
|
|
|
||
|
|
void createWindow(bool noVSync)
|
||
|
|
{
|
||
|
|
static QColor colors[] = { Qt::red, Qt::green, Qt::blue, Qt::yellow, Qt::cyan, Qt::gray };
|
||
|
|
const int n = d.windows.count();
|
||
|
|
d.windows.append(new Window(QString::asprintf("Window #%d%s", n, noVSync ? " (no vsync)" : ""), colors[n % 6], n % 3, noVSync));
|
||
|
|
d.windows.last()->show();
|
||
|
|
}
|
||
|
|
|
||
|
|
void closeWindow()
|
||
|
|
{
|
||
|
|
delete d.windows.takeLast();
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
|
||
|
|
QApplication app(argc, argv);
|
||
|
|
|
||
|
|
#if defined(Q_OS_WIN)
|
||
|
|
graphicsApi = D3D11;
|
||
|
|
#elif defined(Q_OS_DARWIN)
|
||
|
|
graphicsApi = Metal;
|
||
|
|
#elif QT_CONFIG(vulkan)
|
||
|
|
graphicsApi = Vulkan;
|
||
|
|
#else
|
||
|
|
graphicsApi = OpenGL;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
QCommandLineParser cmdLineParser;
|
||
|
|
cmdLineParser.addHelpOption();
|
||
|
|
QCommandLineOption glOption({ "g", "opengl" }, QLatin1String("OpenGL (2.x)"));
|
||
|
|
cmdLineParser.addOption(glOption);
|
||
|
|
QCommandLineOption vkOption({ "v", "vulkan" }, QLatin1String("Vulkan"));
|
||
|
|
cmdLineParser.addOption(vkOption);
|
||
|
|
QCommandLineOption d3dOption({ "d", "d3d11" }, QLatin1String("Direct3D 11"));
|
||
|
|
cmdLineParser.addOption(d3dOption);
|
||
|
|
QCommandLineOption mtlOption({ "m", "metal" }, QLatin1String("Metal"));
|
||
|
|
cmdLineParser.addOption(mtlOption);
|
||
|
|
cmdLineParser.process(app);
|
||
|
|
if (cmdLineParser.isSet(glOption))
|
||
|
|
graphicsApi = OpenGL;
|
||
|
|
if (cmdLineParser.isSet(vkOption))
|
||
|
|
graphicsApi = Vulkan;
|
||
|
|
if (cmdLineParser.isSet(d3dOption))
|
||
|
|
graphicsApi = D3D11;
|
||
|
|
if (cmdLineParser.isSet(mtlOption))
|
||
|
|
graphicsApi = Metal;
|
||
|
|
|
||
|
|
qDebug("Selected graphics API is %s", qPrintable(graphicsApiName()));
|
||
|
|
qDebug("This is a multi-api example, use command line arguments to override:\n%s", qPrintable(cmdLineParser.helpText()));
|
||
|
|
|
||
|
|
#if QT_CONFIG(vulkan)
|
||
|
|
r.instance = new QVulkanInstance;
|
||
|
|
if (graphicsApi == Vulkan) {
|
||
|
|
#ifndef Q_OS_ANDROID
|
||
|
|
r.instance->setLayers({ "VK_LAYER_LUNARG_standard_validation" });
|
||
|
|
#else
|
||
|
|
r.instance->setLayers(QByteArrayList()
|
||
|
|
<< "VK_LAYER_GOOGLE_threading"
|
||
|
|
<< "VK_LAYER_LUNARG_parameter_validation"
|
||
|
|
<< "VK_LAYER_LUNARG_object_tracker"
|
||
|
|
<< "VK_LAYER_LUNARG_core_validation"
|
||
|
|
<< "VK_LAYER_LUNARG_image"
|
||
|
|
<< "VK_LAYER_LUNARG_swapchain"
|
||
|
|
<< "VK_LAYER_GOOGLE_unique_objects");
|
||
|
|
#endif
|
||
|
|
if (!r.instance->create()) {
|
||
|
|
qWarning("Failed to create Vulkan instance, switching to OpenGL");
|
||
|
|
graphicsApi = OpenGL;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
createRhi();
|
||
|
|
|
||
|
|
int winCount = 0;
|
||
|
|
QWidget w;
|
||
|
|
w.resize(800, 600);
|
||
|
|
w.setWindowTitle(QCoreApplication::applicationName() + QLatin1String(" - ") + graphicsApiName());
|
||
|
|
QVBoxLayout *layout = new QVBoxLayout(&w);
|
||
|
|
|
||
|
|
QPlainTextEdit *info = new QPlainTextEdit(
|
||
|
|
QLatin1String("This application tests rendering with the same QRhi instance (and so the same Vulkan/Metal/D3D device or OpenGL context) "
|
||
|
|
"to multiple windows via multiple QRhiSwapChain objects, from the same one thread. Some resources are shared across all windows.\n"
|
||
|
|
"\nNote that the behavior may differ depending on the underlying graphics API implementation and the number of windows. "
|
||
|
|
"One challenge here is the vsync throttling: with the default vsync/fifo presentation mode the behavior may differ between "
|
||
|
|
"platforms, drivers, and APIs as we present different swapchains' images in a row on the same thread. As a potential solution, "
|
||
|
|
"setting NoVSync on the second, third, and later window swapchains is offered as an option.\n"
|
||
|
|
"\n\nUsing API: ") + graphicsApiName());
|
||
|
|
info->setReadOnly(true);
|
||
|
|
layout->addWidget(info);
|
||
|
|
QLabel *label = new QLabel(QLatin1String("Window count: 0"));
|
||
|
|
layout->addWidget(label);
|
||
|
|
QCheckBox *vsCb = new QCheckBox(QLatin1String("Set NoVSync on all swapchains except the first"));
|
||
|
|
vsCb->setChecked(false);
|
||
|
|
layout->addWidget(vsCb);
|
||
|
|
QPushButton *btn = new QPushButton(QLatin1String("New window"));
|
||
|
|
QObject::connect(btn, &QPushButton::clicked, btn, [label, vsCb, &winCount] {
|
||
|
|
winCount += 1;
|
||
|
|
label->setText(QString::asprintf("Window count: %d", winCount));
|
||
|
|
const bool noVSync = vsCb->isChecked() && winCount > 1;
|
||
|
|
createWindow(noVSync);
|
||
|
|
});
|
||
|
|
layout->addWidget(btn);
|
||
|
|
btn = new QPushButton(QLatin1String("Close window"));
|
||
|
|
QObject::connect(btn, &QPushButton::clicked, btn, [label, &winCount] {
|
||
|
|
if (winCount > 0) {
|
||
|
|
winCount -= 1;
|
||
|
|
label->setText(QString::asprintf("Window count: %d", winCount));
|
||
|
|
closeWindow();
|
||
|
|
}
|
||
|
|
});
|
||
|
|
layout->addWidget(btn);
|
||
|
|
w.show();
|
||
|
|
|
||
|
|
int result = app.exec();
|
||
|
|
|
||
|
|
qDeleteAll(d.windows);
|
||
|
|
|
||
|
|
destroySharedResources();
|
||
|
|
destroyRhi();
|
||
|
|
|
||
|
|
#if QT_CONFIG(vulkan)
|
||
|
|
delete r.instance;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|