Restore multi-threaded OpenGL path in rendercontrol_opengl example

Porting from the Qt5. Pick-to: 6.11 Task-number: QTBUG-102301 Change-Id: Ic4aa3e4c3f759ccd6e04ef77ed5c2f888e7f9aa0 Reviewed-by: JiDe Zhang <zhangjide@uniontech.com> Reviewed-by: Liang Qi <liang.qi@qt.io>
author: JiDe Zhang <zhangjide@uniontech.com> 2022-04-05 16:01:19 +0800
committer: JiDe Zhang <zhangjide@uniontech.com> 2025-12-12 15:35:42 +0800
commit: 2e0e3000db2c76d6b20affc95498ee2bf5bdbc43 (patch)
tree: ea7a204d385290a08185f91aea8dfe36fefcdda8 /examples/quick/rendercontrol/rendercontrol_opengl
parent: 712dbe34bc7c10d8503f0bc352eced2d890fb7af (diff)
5 files changed, 591 insertions, 5 deletions
diff --git a/examples/quick/rendercontrol/rendercontrol_opengl/CMakeLists.txt b/examples/quick/rendercontrol/rendercontrol_opengl/CMakeLists.txt
index ac277f533c..0c5021f7a8 100644
--- a/examples/quick/rendercontrol/rendercontrol_opengl/CMakeLists.txt
+++ b/examples/quick/rendercontrol/rendercontrol_opengl/CMakeLists.txt
@@ -4,7 +4,7 @@
 cmake_minimum_required(VERSION 3.16)
 project(rendercontrol_opengl LANGUAGES CXX)
 
-find_package(Qt6 REQUIRED COMPONENTS Core Gui OpenGL Qml Quick)
+find_package(Qt6 REQUIRED COMPONENTS Core Gui GuiPrivate OpenGL Qml Quick)
 
 qt_standard_project_setup(REQUIRES 6.8)
 
@@ -12,11 +12,13 @@ qt_add_executable(rendercontrol_openglexample WIN32 MACOSX_BUNDLE
     cuberenderer.cpp cuberenderer.h
     main.cpp
     window_singlethreaded.cpp window_singlethreaded.h
+    window_multithreaded.cpp window_multithreaded.h
 )
 
 target_link_libraries(rendercontrol_openglexample PRIVATE
     Qt6::Core
     Qt6::Gui
+    Qt6::GuiPrivate
     Qt6::OpenGL
     Qt6::Qml
     Qt6::Quick
diff --git a/examples/quick/rendercontrol/rendercontrol_opengl/main.cpp b/examples/quick/rendercontrol/rendercontrol_opengl/main.cpp
index 849d9d38d6..f882109545 100644
--- a/examples/quick/rendercontrol/rendercontrol_opengl/main.cpp
+++ b/examples/quick/rendercontrol/rendercontrol_opengl/main.cpp
@@ -3,7 +3,9 @@
 
 #include <QGuiApplication>
 #include <QQuickWindow>
+#include <QCommandLineParser>
 #include "window_singlethreaded.h"
+#include "window_multithreaded.h"
 
 int main(int argc, char **argv)
 {
@@ -12,9 +14,29 @@ int main(int argc, char **argv)
     // only functional when Qt Quick is also using OpenGL
     QQuickWindow::setGraphicsApi(QSGRendererInterface::OpenGL);
 
-    WindowSingleThreaded window;
-    window.resize(1024, 768);
-    window.show();
+    QCoreApplication::setApplicationName("Qt Render Control Example");
+    QCoreApplication::setOrganizationName("QtProject");
+    QCoreApplication::setApplicationVersion(QT_VERSION_STR);
+    QCommandLineParser parser;
+    parser.setApplicationDescription(QCoreApplication::applicationName());
+    parser.addHelpOption();
+    parser.addVersionOption();
+    QCommandLineOption threadedOption("threaded", "Threaded Rendering");
+    parser.addOption(threadedOption);
+
+    parser.process(app);
+
+    QScopedPointer<QWindow> window;
+    if (parser.isSet(threadedOption)) {
+        qWarning("Using separate Qt Quick render thread");
+        window.reset(new WindowMultiThreaded);
+    } else {
+        qWarning("Using single-threaded rendering");
+        window.reset(new WindowSingleThreaded);
+    }
+
+    window->resize(1024, 768);
+    window->show();
 
     return app.exec();
 }
diff --git a/examples/quick/rendercontrol/rendercontrol_opengl/rendercontrol_opengl.pro b/examples/quick/rendercontrol/rendercontrol_opengl/rendercontrol_opengl.pro
index 3f32a0dff4..783fdf096d 100644
--- a/examples/quick/rendercontrol/rendercontrol_opengl/rendercontrol_opengl.pro
+++ b/examples/quick/rendercontrol/rendercontrol_opengl/rendercontrol_opengl.pro
@@ -1,12 +1,14 @@
 TEMPLATE = app
 
-QT += quick qml opengl
+QT += quick qml opengl gui-private
 
 SOURCES += main.cpp \
            window_singlethreaded.cpp \
+           window_multithreaded.cpp \
            cuberenderer.cpp
 
 HEADERS += window_singlethreaded.h \
+           window_multithreaded.h \
            cuberenderer.h
 
 RESOURCES += rendercontrol.qrc
diff --git a/examples/quick/rendercontrol/rendercontrol_opengl/window_multithreaded.cpp b/examples/quick/rendercontrol/rendercontrol_opengl/window_multithreaded.cpp
new file mode 100644
index 0000000000..f858e20e8f
--- /dev/null
+++ b/examples/quick/rendercontrol/rendercontrol_opengl/window_multithreaded.cpp
@@ -0,0 +1,452 @@
+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "window_multithreaded.h"
+#include "cuberenderer.h"
+#include <QOpenGLContext>
+#include <QOpenGLFunctions>
+#include <QOpenGLFramebufferObject>
+#include <QOpenGLShaderProgram>
+#include <QOpenGLVertexArrayObject>
+#include <QOpenGLBuffer>
+#include <QOpenGLVertexArrayObject>
+#include <QOffscreenSurface>
+#include <QQmlEngine>
+#include <QQmlComponent>
+#include <QQuickItem>
+#include <QQuickWindow>
+#include <QQuickRenderControl>
+#include <QQuickRenderTarget>
+#include <QCoreApplication>
+#include <QQuickGraphicsDevice>
+#include <QQuickGraphicsConfiguration>
+#include <rhi/qrhi.h>
+
+/*
+  This implementation runs the Qt Quick scenegraph's sync and render phases on a
+  separate, dedicated thread.  Rendering the cube using our custom OpenGL engine
+  happens on that thread as well.  This is similar to the built-in threaded
+  render loop, but does not support all the features. There is no support for
+  getting Animators running on the render thread for example.
+
+  We choose to use QObject's event mechanism to communicate with the QObject
+  living on the render thread. An alternative would be to subclass QThread and
+  reimplement run() with a custom event handling approach, like
+  QSGThreadedRenderLoop does. That would potentially lead to better results but
+  is also more complex.
+*/
+
+static const QEvent::Type INIT = QEvent::Type(QEvent::User + 1);
+static const QEvent::Type RENDER = QEvent::Type(QEvent::User + 2);
+static const QEvent::Type RESIZE = QEvent::Type(QEvent::User + 3);
+static const QEvent::Type CLEANUP = QEvent::Type(QEvent::User + 4);
+static const QEvent::Type STOP = QEvent::Type(QEvent::User + 5);
+
+static const QEvent::Type UPDATE = QEvent::Type(QEvent::User + 6);
+
+QuickRenderer::QuickRenderer()
+    : m_context(nullptr),
+      m_surface(nullptr),
+      m_window(nullptr),
+      m_quickWindow(nullptr),
+      m_renderControl(nullptr),
+      m_rhi(nullptr),
+      m_textureId(0),
+      m_cubeRenderer(nullptr),
+      m_quit(false)
+{
+}
+
+void QuickRenderer::requestInit()
+{
+    QCoreApplication::postEvent(this, new QEvent(INIT));
+}
+
+void QuickRenderer::requestRender()
+{
+    QCoreApplication::postEvent(this, new QEvent(RENDER));
+}
+
+void QuickRenderer::requestResize()
+{
+    QCoreApplication::postEvent(this, new QEvent(RESIZE));
+}
+
+void QuickRenderer::requestCleanup()
+{
+    QCoreApplication::postEvent(this, new QEvent(CLEANUP));
+}
+
+void QuickRenderer::requestStop()
+{
+    QCoreApplication::postEvent(this, new QEvent(STOP));
+}
+
+bool QuickRenderer::event(QEvent *e)
+{
+    QMutexLocker lock(&m_mutex);
+
+    switch (int(e->type())) {
+    case INIT:
+        init();
+        return true;
+    case RENDER:
+        render(&lock);
+        return true;
+    case RESIZE:
+        if (m_cubeRenderer)
+            m_cubeRenderer->resize(m_window->width(), m_window->height());
+        return true;
+    case CLEANUP:
+        cleanup();
+        return true;
+    case STOP:
+        cleanupRhi();
+        return true;
+    default:
+        return QObject::event(e);
+    }
+}
+
+void QuickRenderer::init()
+{
+    m_context->makeCurrent(m_surface);
+
+    // Pass our offscreen surface to the cube renderer just so that it will
+    // have something is can make current during cleanup. QOffscreenSurface,
+    // just like QWindow, must always be created on the gui thread (as it might
+    // be backed by an actual QWindow).
+    m_cubeRenderer = new CubeRenderer(m_surface);
+    m_cubeRenderer->resize(m_window->width(), m_window->height());
+
+    const QSurfaceFormat format = m_quickWindow->requestedFormat();
+    QRhiGles2InitParams rhiParams;
+    rhiParams.format = format;
+    rhiParams.fallbackSurface = m_surface;
+    rhiParams.window = m_quickWindow;
+    QRhiGles2NativeHandles importDev;
+    importDev.context = m_context;
+
+    m_rhi = QRhi::create(QRhi::OpenGLES2, &rhiParams, {}, &importDev);
+    m_quickWindow->setGraphicsDevice(QQuickGraphicsDevice::fromRhi(m_rhi));
+
+    m_renderControl->initialize();
+}
+
+void QuickRenderer::cleanup()
+{
+    m_context->makeCurrent(m_surface);
+
+    m_renderControl->invalidate();
+
+    if (m_textureId)
+        m_context->functions()->glDeleteTextures(1, &m_textureId);
+
+    delete m_cubeRenderer;
+    m_cubeRenderer = nullptr;
+
+    m_quickWindow->setGraphicsDevice({});
+    m_quickWindow->setRenderTarget({});
+
+    m_context->doneCurrent();
+
+    m_cond.wakeOne();
+}
+
+void QuickRenderer::cleanupRhi()
+{
+    delete m_rhi;
+    m_rhi = nullptr;
+    m_context->moveToThread(QCoreApplication::instance()->thread());
+
+    m_cond.wakeOne();
+}
+
+void QuickRenderer::ensureTexture()
+{
+    qreal dpr = m_quickWindow->devicePixelRatio();
+    QSize textureSize = m_quickWindow->size() * dpr;
+    QOpenGLFunctions *f = m_context->functions();
+    f->glGenTextures(1, &m_textureId);
+    f->glBindTexture(GL_TEXTURE_2D, m_textureId);
+    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    f->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, textureSize.width(), textureSize.height(), 0,
+                    GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
+    m_quickWindow->setRenderTarget(QQuickRenderTarget::fromOpenGLTexture(m_textureId, textureSize));
+}
+
+void QuickRenderer::render(QMutexLocker<QMutex> *lock)
+{
+    Q_ASSERT(QThread::currentThread() != m_window->thread());
+
+    if (!m_context->makeCurrent(m_surface)) {
+        qWarning("Failed to make context current on render thread");
+        return;
+    }
+
+    ensureTexture();
+
+    m_renderControl->beginFrame();
+    // Synchronization and rendering happens here on the render thread.
+    m_renderControl->sync();
+
+    // The gui thread can now continue.
+    m_cond.wakeOne();
+    lock->unlock();
+
+    // Meanwhile on this thread continue with the actual rendering (into the FBO first).
+    m_renderControl->render();
+    m_renderControl->endFrame();
+    m_context->functions()->glFlush();
+
+    // The cube renderer uses its own context, no need to bother with the state here.
+
+    // Get something onto the screen using our custom OpenGL engine.
+    QMutexLocker quitLock(&m_quitMutex);
+    if (!m_quit)
+        m_cubeRenderer->render(m_window, m_context, m_textureId);
+}
+
+void QuickRenderer::aboutToQuit()
+{
+    QMutexLocker lock(&m_quitMutex);
+    m_quit = true;
+}
+
+class RenderControl : public QQuickRenderControl
+{
+public:
+    RenderControl(QWindow *w) : m_window(w) { }
+    QWindow *renderWindow(QPoint *offset) override;
+
+private:
+    QWindow *m_window;
+};
+
+WindowMultiThreaded::WindowMultiThreaded()
+    : m_qmlComponent(nullptr),
+      m_rootItem(nullptr),
+      m_quickInitialized(false),
+      m_psrRequested(false)
+{
+    setSurfaceType(QSurface::OpenGLSurface);
+
+    QSurfaceFormat format;
+    // Qt Quick may need a depth and stencil buffer. Always make sure these are available.
+    format.setDepthBufferSize(16);
+    format.setStencilBufferSize(8);
+    setFormat(format);
+
+    m_context = new QOpenGLContext;
+    m_context->setFormat(format);
+    m_context->create();
+
+    m_offscreenSurface = new QOffscreenSurface;
+    // Pass m_context->format(), not format. Format does not specify and color buffer
+    // sizes, while the context, that has just been created, reports a format that has
+    // these values filled in. Pass this to the offscreen surface to make sure it will be
+    // compatible with the context's configuration.
+    m_offscreenSurface->setFormat(m_context->format());
+    m_offscreenSurface->create();
+
+    m_renderControl = new RenderControl(this);
+
+    // Create a QQuickWindow that is associated with out render control. Note that this
+    // window never gets created or shown, meaning that it will never get an underlying
+    // native (platform) window.
+    m_quickWindow = new QQuickWindow(m_renderControl);
+
+    // Create a QML engine.
+    m_qmlEngine = new QQmlEngine;
+    if (!m_qmlEngine->incubationController())
+        m_qmlEngine->setIncubationController(m_quickWindow->incubationController());
+
+    m_quickRenderer = new QuickRenderer;
+    m_quickRenderer->setContext(m_context);
+
+    // These live on the gui thread. Just give access to them on the render thread.
+    m_quickRenderer->setSurface(m_offscreenSurface);
+    m_quickRenderer->setWindow(this);
+    m_quickRenderer->setQuickWindow(m_quickWindow);
+    m_quickRenderer->setRenderControl(m_renderControl);
+
+    m_quickRendererThread = new QThread;
+
+    // Notify the render control that some scenegraph internals have to live on
+    // m_quickRenderThread.
+    m_renderControl->prepareThread(m_quickRendererThread);
+
+    // The QOpenGLContext and the QObject representing the rendering logic on
+    // the render thread must live on that thread.
+    m_context->moveToThread(m_quickRendererThread);
+    m_quickRenderer->moveToThread(m_quickRendererThread);
+
+    m_quickRendererThread->start();
+
+    // Now hook up the signals. For simplicy we don't differentiate
+    // between renderRequested (only render is needed, no sync) and
+    // sceneChanged (polish and sync is needed too).
+    connect(m_renderControl, &QQuickRenderControl::renderRequested, this, &WindowMultiThreaded::requestUpdate);
+    connect(m_renderControl, &QQuickRenderControl::sceneChanged, this, &WindowMultiThreaded::requestUpdate);
+}
+
+WindowMultiThreaded::~WindowMultiThreaded()
+{
+    // Release resources and move the context ownership back to this thread.
+    m_quickRenderer->mutex()->lock();
+    m_quickRenderer->requestCleanup();
+    m_quickRenderer->cond()->wait(m_quickRenderer->mutex());
+    m_quickRenderer->mutex()->unlock();
+
+    delete m_renderControl;
+    delete m_qmlComponent;
+    delete m_quickWindow;
+    delete m_qmlEngine;
+
+    // Release rhi
+    m_quickRenderer->mutex()->lock();
+    m_quickRenderer->requestStop();
+    m_quickRenderer->cond()->wait(m_quickRenderer->mutex());
+    m_quickRenderer->mutex()->unlock();
+
+    m_quickRendererThread->quit();
+    m_quickRendererThread->wait();
+    delete m_quickRenderer;
+
+    delete m_offscreenSurface;
+    delete m_context;
+}
+
+void WindowMultiThreaded::requestUpdate()
+{
+    if (m_quickInitialized && !m_psrRequested) {
+        m_psrRequested = true;
+        QCoreApplication::postEvent(this, new QEvent(UPDATE));
+    }
+}
+
+bool WindowMultiThreaded::event(QEvent *e)
+{
+    if (e->type() == UPDATE) {
+        polishSyncAndRender();
+        m_psrRequested = false;
+        return true;
+    } else if (e->type() == QEvent::Close) {
+        // Avoid rendering on the render thread when the window is about to
+        // close. Once a QWindow is closed, the underlying platform window will
+        // go away, even though the QWindow instance itself is still
+        // valid. Operations like swapBuffers() are futile and only result in
+        // warnings afterwards. Prevent this.
+        m_quickRenderer->aboutToQuit();
+    }
+    return QWindow::event(e);
+}
+
+void WindowMultiThreaded::polishSyncAndRender()
+{
+    Q_ASSERT(QThread::currentThread() == thread());
+
+    // Polishing happens on the gui thread.
+    m_renderControl->polishItems();
+    // Sync happens on the render thread with the gui thread (this one) blocked.
+    QMutexLocker lock(m_quickRenderer->mutex());
+    m_quickRenderer->requestRender();
+    // Wait until sync is complete.
+    m_quickRenderer->cond()->wait(m_quickRenderer->mutex());
+    // Rendering happens on the render thread without blocking the gui (main)
+    // thread. This is good because the blocking swap (waiting for vsync)
+    // happens on the render thread, not blocking other work.
+}
+
+void WindowMultiThreaded::run()
+{
+    disconnect(m_qmlComponent, &QQmlComponent::statusChanged, this, &WindowMultiThreaded::run);
+
+    if (m_qmlComponent->isError()) {
+        const QList<QQmlError> errorList = m_qmlComponent->errors();
+        for (const QQmlError &error : errorList)
+            qWarning() << error.url() << error.line() << error;
+        return;
+    }
+
+    QObject *rootObject = m_qmlComponent->create();
+    if (m_qmlComponent->isError()) {
+        const QList<QQmlError> errorList = m_qmlComponent->errors();
+        for (const QQmlError &error : errorList)
+            qWarning() << error.url() << error.line() << error;
+        return;
+    }
+
+    m_rootItem = qobject_cast<QQuickItem *>(rootObject);
+    if (!m_rootItem) {
+        qWarning("run: Not a QQuickItem");
+        delete rootObject;
+        return;
+    }
+
+    // The root item is ready. Associate it with the window.
+    m_rootItem->setParentItem(m_quickWindow->contentItem());
+
+    // Update item and rendering related geometries.
+    updateSizes();
+
+    m_quickInitialized = true;
+
+    // Initialize the render thread and perform the first polish/sync/render.
+    m_quickRenderer->requestInit();
+    polishSyncAndRender();
+}
+
+void WindowMultiThreaded::updateSizes()
+{
+    // Behave like SizeRootObjectToView.
+    m_rootItem->setWidth(width());
+    m_rootItem->setHeight(height());
+
+    m_quickWindow->setGeometry(0, 0, width(), height());
+}
+
+void WindowMultiThreaded::startQuick(const QString &filename)
+{
+    m_qmlComponent = new QQmlComponent(m_qmlEngine, QUrl(filename));
+    if (m_qmlComponent->isLoading())
+        connect(m_qmlComponent, &QQmlComponent::statusChanged, this, &WindowMultiThreaded::run);
+    else
+        run();
+}
+
+void WindowMultiThreaded::exposeEvent(QExposeEvent *)
+{
+    if (isExposed()) {
+        if (!m_quickInitialized)
+            startQuick(QStringLiteral("qrc:/qt/qml/rendercontrol/demo.qml"));
+    }
+}
+
+void WindowMultiThreaded::resizeEvent(QResizeEvent *)
+{
+    // If this is a resize after the scene is up and running, recreate the fbo and the
+    // Quick item and scene.
+    if (m_rootItem) {
+        updateSizes();
+        m_quickRenderer->requestResize();
+        polishSyncAndRender();
+    }
+}
+
+void WindowMultiThreaded::mousePressEvent(QMouseEvent *e)
+{
+    // Use the constructor taking localPos and screenPos. That puts localPos into the
+    // event's localPos and windowPos, and screenPos into the event's screenPos. This way
+    // the windowPos in e is ignored and is replaced by localPos. This is necessary
+    // because QQuickWindow thinks of itself as a top-level window always.
+    QMouseEvent mappedEvent(e->type(), e->position(), e->globalPosition(), e->button(), e->buttons(), e->modifiers());
+    QCoreApplication::sendEvent(m_quickWindow, &mappedEvent);
+}
+
+void WindowMultiThreaded::mouseReleaseEvent(QMouseEvent *e)
+{
+    QMouseEvent mappedEvent(e->type(), e->position(), e->globalPosition(), e->button(), e->buttons(), e->modifiers());
+    QCoreApplication::sendEvent(m_quickWindow, &mappedEvent);
+}
diff --git a/examples/quick/rendercontrol/rendercontrol_opengl/window_multithreaded.h b/examples/quick/rendercontrol/rendercontrol_opengl/window_multithreaded.h
new file mode 100644
index 0000000000..e505080081
--- /dev/null
+++ b/examples/quick/rendercontrol/rendercontrol_opengl/window_multithreaded.h
@@ -0,0 +1,108 @@
+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef WINDOW_MULTITHREADED_H
+#define WINDOW_MULTITHREADED_H
+
+#include <QWindow>
+#include <QMatrix4x4>
+#include <QThread>
+#include <QWaitCondition>
+#include <QMutex>
+
+QT_FORWARD_DECLARE_CLASS(QOpenGLContext)
+QT_FORWARD_DECLARE_CLASS(QOffscreenSurface)
+QT_FORWARD_DECLARE_CLASS(QQuickRenderControl)
+QT_FORWARD_DECLARE_CLASS(QQuickWindow)
+QT_FORWARD_DECLARE_CLASS(QQmlEngine)
+QT_FORWARD_DECLARE_CLASS(QQmlComponent)
+QT_FORWARD_DECLARE_CLASS(QQuickItem)
+QT_FORWARD_DECLARE_CLASS(QRhi)
+
+class CubeRenderer;
+
+class QuickRenderer : public QObject
+{
+    Q_OBJECT
+
+public:
+    QuickRenderer();
+
+    void requestInit();
+    void requestRender();
+    void requestResize();
+    void requestCleanup();
+    void requestStop();
+
+    QWaitCondition *cond() { return &m_cond; }
+    QMutex *mutex() { return &m_mutex; }
+
+    void setContext(QOpenGLContext *ctx) { m_context = ctx; }
+    void setSurface(QOffscreenSurface *s) { m_surface = s; }
+    void setWindow(QWindow *w) { m_window = w; }
+    void setQuickWindow(QQuickWindow *w) { m_quickWindow = w; }
+    void setRenderControl(QQuickRenderControl *r) { m_renderControl = r; }
+
+    void aboutToQuit();
+
+private:
+    bool event(QEvent *e) override;
+    void init();
+    void cleanup();
+    void cleanupRhi();
+    void ensureTexture();
+    void render(QMutexLocker<QMutex> *lock);
+
+    QWaitCondition m_cond;
+    QMutex m_mutex;
+    QOpenGLContext *m_context;
+    QOffscreenSurface *m_surface;
+    QWindow *m_window;
+    QQuickWindow *m_quickWindow;
+    QQuickRenderControl *m_renderControl;
+    QRhi *m_rhi;
+    uint m_textureId;
+    CubeRenderer *m_cubeRenderer;
+    QMutex m_quitMutex;
+    bool m_quit;
+};
+
+class WindowMultiThreaded : public QWindow
+{
+    Q_OBJECT
+
+public:
+    WindowMultiThreaded();
+    ~WindowMultiThreaded();
+
+protected:
+    void exposeEvent(QExposeEvent *e) override;
+    void resizeEvent(QResizeEvent *e) override;
+    void mousePressEvent(QMouseEvent *e) override;
+    void mouseReleaseEvent(QMouseEvent *e) override;
+    bool event(QEvent *e) override;
+
+private slots:
+    void run();
+    void requestUpdate();
+    void polishSyncAndRender();
+
+private:
+    void startQuick(const QString &filename);
+    void updateSizes();
+
+    QuickRenderer *m_quickRenderer;
+    QThread *m_quickRendererThread;
+
+    QOpenGLContext *m_context;
+    QOffscreenSurface *m_offscreenSurface;
+    QQuickRenderControl *m_renderControl;
+    QQuickWindow *m_quickWindow;
+    QQmlEngine *m_qmlEngine;
+    QQmlComponent *m_qmlComponent;
+    QQuickItem *m_rootItem;
+    bool m_quickInitialized;
+    bool m_psrRequested;
+};
+
+#endif
author	JiDe Zhang <zhangjide@uniontech.com>	2022-04-05 16:01:19 +0800
committer	JiDe Zhang <zhangjide@uniontech.com>	2025-12-12 15:35:42 +0800
commit	2e0e3000db2c76d6b20affc95498ee2bf5bdbc43 (patch)
tree	ea7a204d385290a08185f91aea8dfe36fefcdda8 /examples/quick/rendercontrol/rendercontrol_opengl
parent	712dbe34bc7c10d8503f0bc352eced2d890fb7af (diff)