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Support threading with QQuickRenderControl 

Reorganize the rendercontrol example to demonstrate both the single
and multi threaded approaches.

A small helper function is introduced to the QQuickRenderControl API:
The QSGRenderContext has to live on the render thread. Previously there
was no way for applications to move it to the desired thread. This is
now possible.

Pass --threaded to the rendercontrol example to use a separate render thread.

[ChangeLog][QtQuick] QQuickRenderControl can now be used to render the Qt Quick
scene on a dedicated render thread, similarly to how the built-in threaded render
loop operates.

Task-number: QTBUG-42813
Change-Id: I01c3b2ffca8a174d9d2c267a51f2e484ed7b34b3
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>
Reviewed-by: Jørgen Lind <jorgen.lind@theqtcompany.com>
This commit is contained in:
Laszlo Agocs 2014-11-25 11:38:46 +01:00
parent 2a6f6eee10
commit 6179550a0c
10 changed files with 955 additions and 202 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

216
examples/quick/rendercontrol/cuberenderer.cpp Normal file
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@ -0,0 +1,216 @@
/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "cuberenderer.h"
#include <QOpenGLContext>
#include <QOpenGLFunctions>
#include <QOpenGLShaderProgram>
#include <QOpenGLVertexArrayObject>
#include <QOpenGLBuffer>
#include <QOpenGLVertexArrayObject>
#include <QOffscreenSurface>
#include <QWindow>
CubeRenderer::CubeRenderer()
: m_context(0),
m_program(0),
m_vbo(0)
{
}
CubeRenderer::~CubeRenderer()
{
// Use a temporary offscreen surface to do the cleanup.
// There may not be a native window surface available anymore at this stage.
QScopedPointer<QOffscreenSurface> offscreenSurface(new QOffscreenSurface);
offscreenSurface->setFormat(m_context->format());
offscreenSurface->create();
m_context->makeCurrent(offscreenSurface.data());
delete m_program;
delete m_vbo;
delete m_vao;
m_context->doneCurrent();
delete m_context;
}
void CubeRenderer::init(QWindow *w, QOpenGLContext *share)
{
m_context = new QOpenGLContext;
m_context->setShareContext(share);
m_context->setFormat(w->requestedFormat());
m_context->create();
if (!m_context->makeCurrent(w))
return;
QOpenGLFunctions *f = m_context->functions();
f->glClearColor(0.0f, 0.1f, 0.25f, 1.0f);
f->glViewport(0, 0, w->width() * w->devicePixelRatio(), w->height() * w->devicePixelRatio());
static const char *vertexShaderSource =
"attribute highp vec4 vertex;\n"
"attribute lowp vec2 coord;\n"
"varying lowp vec2 v_coord;\n"
"uniform highp mat4 matrix;\n"
"void main() {\n"
" v_coord = coord;\n"
" gl_Position = matrix * vertex;\n"
"}\n";
static const char *fragmentShaderSource =
"varying lowp vec2 v_coord;\n"
"uniform sampler2D sampler;\n"
"void main() {\n"
" gl_FragColor = vec4(texture2D(sampler, v_coord).rgb, 1.0);\n"
"}\n";
m_program = new QOpenGLShaderProgram;
m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, vertexShaderSource);
m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, fragmentShaderSource);
m_program->bindAttributeLocation("vertex", 0);
m_program->bindAttributeLocation("coord", 1);
m_program->link();
m_matrixLoc = m_program->uniformLocation("matrix");
m_vao = new QOpenGLVertexArrayObject;
m_vao->create();
QOpenGLVertexArrayObject::Binder vaoBinder(m_vao);
m_vbo = new QOpenGLBuffer;
m_vbo->create();
m_vbo->bind();
GLfloat v[] = {
-0.5, 0.5, 0.5, 0.5,-0.5,0.5,-0.5,-0.5,0.5,
0.5, -0.5, 0.5, -0.5,0.5,0.5,0.5,0.5,0.5,
-0.5, -0.5, -0.5, 0.5,-0.5,-0.5,-0.5,0.5,-0.5,
0.5, 0.5, -0.5, -0.5,0.5,-0.5,0.5,-0.5,-0.5,
0.5, -0.5, -0.5, 0.5,-0.5,0.5,0.5,0.5,-0.5,
0.5, 0.5, 0.5, 0.5,0.5,-0.5,0.5,-0.5,0.5,
-0.5, 0.5, -0.5, -0.5,-0.5,0.5,-0.5,-0.5,-0.5,
-0.5, -0.5, 0.5, -0.5,0.5,-0.5,-0.5,0.5,0.5,
0.5, 0.5, -0.5, -0.5, 0.5, 0.5, -0.5, 0.5, -0.5,
-0.5, 0.5, 0.5, 0.5, 0.5, -0.5, 0.5, 0.5, 0.5,
-0.5, -0.5, -0.5, -0.5, -0.5, 0.5, 0.5, -0.5, -0.5,
0.5, -0.5, 0.5, 0.5, -0.5, -0.5, -0.5, -0.5, 0.5
};
GLfloat texCoords[] = {
0.0f,0.0f, 1.0f,1.0f, 1.0f,0.0f,
1.0f,1.0f, 0.0f,0.0f, 0.0f,1.0f,
1.0f,1.0f, 1.0f,0.0f, 0.0f,1.0f,
0.0f,0.0f, 0.0f,1.0f, 1.0f,0.0f,
1.0f,1.0f, 1.0f,0.0f, 0.0f,1.0f,
0.0f,0.0f, 0.0f,1.0f, 1.0f,0.0f,
0.0f,0.0f, 1.0f,1.0f, 1.0f,0.0f,
1.0f,1.0f, 0.0f,0.0f, 0.0f,1.0f,
0.0f,1.0f, 1.0f,0.0f, 1.0f,1.0f,
1.0f,0.0f, 0.0f,1.0f, 0.0f,0.0f,
1.0f,0.0f, 1.0f,1.0f, 0.0f,0.0f,
0.0f,1.0f, 0.0f,0.0f, 1.0f,1.0f
};
const int vertexCount = 36;
m_vbo->allocate(sizeof(GLfloat) * vertexCount * 5);
m_vbo->write(0, v, sizeof(GLfloat) * vertexCount * 3);
m_vbo->write(sizeof(GLfloat) * vertexCount * 3, texCoords, sizeof(GLfloat) * vertexCount * 2);
m_vbo->release();
if (m_vao->isCreated())
setupVertexAttribs();
}
void CubeRenderer::resize(int w, int h)
{
m_proj.setToIdentity();
m_proj.perspective(45, w / float(h), 0.01f, 100.0f);
}
void CubeRenderer::setupVertexAttribs()
{
m_vbo->bind();
m_program->enableAttributeArray(0);
m_program->enableAttributeArray(1);
m_context->functions()->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
m_context->functions()->glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0,
(const void *)(36 * 3 * sizeof(GLfloat)));
m_vbo->release();
}
void CubeRenderer::render(QWindow *w, QOpenGLContext *share, uint texture)
{
if (!m_context)
init(w, share);
if (!m_context->makeCurrent(w))
return;
QOpenGLFunctions *f = m_context->functions();
f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
if (texture) {
f->glBindTexture(GL_TEXTURE_2D, texture);
f->glFrontFace(GL_CW); // because our cube's vertex data is such
f->glEnable(GL_CULL_FACE);
f->glEnable(GL_DEPTH_TEST);
m_program->bind();
QOpenGLVertexArrayObject::Binder vaoBinder(m_vao);
// If VAOs are not supported, set the vertex attributes every time.
if (!m_vao->isCreated())
setupVertexAttribs();
static GLfloat angle = 0;
QMatrix4x4 m;
m.translate(0, 0, -2);
m.rotate(90, 0, 0, 1);
m.rotate(angle, 0.5, 1, 0);
angle += 0.5f;
m_program->setUniformValue(m_matrixLoc, m_proj * m);
// Draw the cube.
f->glDrawArrays(GL_TRIANGLES, 0, 36);
}
m_context->swapBuffers(w);
}

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examples/quick/rendercontrol/cuberenderer.h Normal file
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@ -0,0 +1,73 @@
/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef CUBERENDERER_H
#define CUBERENDERER_H
#include <QMatrix4x4>
QT_FORWARD_DECLARE_CLASS(QOpenGLContext)
QT_FORWARD_DECLARE_CLASS(QOpenGLShaderProgram)
QT_FORWARD_DECLARE_CLASS(QOpenGLBuffer)
QT_FORWARD_DECLARE_CLASS(QOpenGLVertexArrayObject)
QT_FORWARD_DECLARE_CLASS(QWindow)
class CubeRenderer
{
public:
CubeRenderer();
~CubeRenderer();
void resize(int w, int h);
void render(QWindow *w, QOpenGLContext *share, uint texture);
private:
void init(QWindow *w, QOpenGLContext *share);
void setupVertexAttribs();
QOpenGLContext *m_context;
QOpenGLShaderProgram *m_program;
QOpenGLBuffer *m_vbo;
QOpenGLVertexArrayObject *m_vao;
int m_matrixLoc;
QMatrix4x4 m_proj;
};
#endif

19
examples/quick/rendercontrol/main.cpp
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@ -39,13 +39,24 @@
****************************************************************************/
#include <QGuiApplication>
#include "window.h"
#include "window_singlethreaded.h"
#include "window_multithreaded.h"
int main(int argc, char **argv)
{
QGuiApplication app(argc, argv);
Window window;
window.resize(1024, 768);
window.show();
QScopedPointer<QWindow> window;
if (QCoreApplication::arguments().contains(QLatin1String("--threaded"))) {
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();
}

10
examples/quick/rendercontrol/rendercontrol.pro
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@ -2,8 +2,14 @@ TEMPLATE = app
QT += quick qml
SOURCES += main.cpp window.cpp
HEADERS += window.h
SOURCES += main.cpp \
window_singlethreaded.cpp \
window_multithreaded.cpp \
cuberenderer.cpp
HEADERS += window_singlethreaded.h \
window_multithreaded.h \
cuberenderer.h
RESOURCES += rendercontrol.qrc

423
examples/quick/rendercontrol/window_multithreaded.cpp Normal file
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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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 <QCoreApplication>
/*
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 STOP = QEvent::Type(QEvent::User + 4);
static const QEvent::Type UPDATE = QEvent::Type(QEvent::User + 5);
QuickRenderer::QuickRenderer()
: m_fbo(0),
m_cubeRenderer(0),
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::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 STOP:
cleanup();
return true;
default:
return QObject::event(e);
}
}
void QuickRenderer::init()
{
m_context->makeCurrent(m_surface);
m_cubeRenderer = new CubeRenderer;
m_cubeRenderer->resize(m_window->width(), m_window->height());
m_renderControl->initialize(m_context);
}
void QuickRenderer::cleanup()
{
m_context->makeCurrent(m_surface);
m_renderControl->invalidate();
delete m_fbo;
m_fbo = 0;
delete m_cubeRenderer;
m_cubeRenderer = 0;
m_context->doneCurrent();
m_context->moveToThread(QCoreApplication::instance()->thread());
m_cond.wakeOne();
}
void QuickRenderer::ensureFbo()
{
if (m_fbo && m_fbo->size() != m_window->size() * m_window->devicePixelRatio()) {
delete m_fbo;
m_fbo = 0;
}
if (!m_fbo) {
m_fbo = new QOpenGLFramebufferObject(m_window->size() * m_window->devicePixelRatio(),
QOpenGLFramebufferObject::CombinedDepthStencil);
m_quickWindow->setRenderTarget(m_fbo);
}
}
void QuickRenderer::render(QMutexLocker *lock)
{
Q_ASSERT(QThread::currentThread() != m_window->thread());
if (!m_context->makeCurrent(m_surface)) {
qWarning("Failed to make context current on render thread");
return;
}
ensureFbo();
// 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();
// 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_fbo->texture());
}
void QuickRenderer::aboutToQuit()
{
QMutexLocker lock(&m_quitMutex);
m_quit = true;
}
WindowMultiThreaded::WindowMultiThreaded()
: m_rootItem(0),
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 QQuickRenderControl(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->requestStop();
m_quickRenderer->cond()->wait(m_quickRenderer->mutex());
m_quickRenderer->mutex()->unlock();
m_quickRendererThread->quit();
m_quickRendererThread->wait();
delete m_renderControl;
delete m_qmlComponent;
delete m_quickWindow;
delete m_qmlEngine;
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, SIGNAL(statusChanged(QQmlComponent::Status)), this, SLOT(run()));
if (m_qmlComponent->isError()) {
QList<QQmlError> errorList = m_qmlComponent->errors();
foreach (const QQmlError &error, errorList)
qWarning() << error.url() << error.line() << error;
return;
}
QObject *rootObject = m_qmlComponent->create();
if (m_qmlComponent->isError()) {
QList<QQmlError> errorList = m_qmlComponent->errors();
foreach (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:/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->localPos(), e->screenPos(), e->button(), e->buttons(), e->modifiers());
QCoreApplication::sendEvent(m_quickWindow, &mappedEvent);
}
void WindowMultiThreaded::mouseReleaseEvent(QMouseEvent *e)
{
QMouseEvent mappedEvent(e->type(), e->localPos(), e->screenPos(), e->button(), e->buttons(), e->modifiers());
QCoreApplication::sendEvent(m_quickWindow, &mappedEvent);
}

142
examples/quick/rendercontrol/window_multithreaded.h Normal file
View File

@ -0,0 +1,142 @@
/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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(QOpenGLFramebufferObject)
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)
class CubeRenderer;
class QuickRenderer : public QObject
{
Q_OBJECT
public:
QuickRenderer();
void requestInit();
void requestRender();
void requestResize();
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) Q_DECL_OVERRIDE;
void init();
void cleanup();
void ensureFbo();
void render(QMutexLocker *lock);
QWaitCondition m_cond;
QMutex m_mutex;
QOpenGLContext *m_context;
QOffscreenSurface *m_surface;
QOpenGLFramebufferObject *m_fbo;
QWindow *m_window;
QQuickWindow *m_quickWindow;
QQuickRenderControl *m_renderControl;
CubeRenderer *m_cubeRenderer;
QMutex m_quitMutex;
bool m_quit;
};
class WindowMultiThreaded : public QWindow
{
Q_OBJECT
public:
WindowMultiThreaded();
~WindowMultiThreaded();
protected:
void exposeEvent(QExposeEvent *e) Q_DECL_OVERRIDE;
void resizeEvent(QResizeEvent *e) Q_DECL_OVERRIDE;
void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
bool event(QEvent *e) Q_DECL_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

229
examples/quick/rendercontrol/window.cpp → examples/quick/rendercontrol/window_singlethreaded.cpp
View File

@ -38,7 +38,8 @@
**
****************************************************************************/
#include "window.h"
#include "window_singlethreaded.h"
#include "cuberenderer.h"
#include <QOpenGLContext>
#include <QOpenGLFunctions>
#include <QOpenGLFramebufferObject>
@ -54,11 +55,9 @@
#include <QQuickRenderControl>
#include <QCoreApplication>
Window::Window()
WindowSingleThreaded::WindowSingleThreaded()
: m_rootItem(0),
m_fbo(0),
m_program(0),
m_vbo(0),
m_quickInitialized(false),
m_quickReady(false)
{
@ -82,6 +81,8 @@ Window::Window()
m_offscreenSurface->setFormat(m_context->format());
m_offscreenSurface->create();
m_cubeRenderer = new CubeRenderer;
m_renderControl = new QQuickRenderControl(this);
// Create a QQuickWindow that is associated with out render control. Note that this
@ -98,18 +99,18 @@ Window::Window()
// a timer with a small interval is used to get better performance.
m_updateTimer.setSingleShot(true);
m_updateTimer.setInterval(5);
connect(&m_updateTimer, &QTimer::timeout, this, &Window::updateQuick);
connect(&m_updateTimer, &QTimer::timeout, this, &WindowSingleThreaded::render);
// 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_quickWindow, &QQuickWindow::sceneGraphInitialized, this, &Window::createFbo);
connect(m_quickWindow, &QQuickWindow::sceneGraphInvalidated, this, &Window::destroyFbo);
connect(m_renderControl, &QQuickRenderControl::renderRequested, this, &Window::requestUpdate);
connect(m_renderControl, &QQuickRenderControl::sceneChanged, this, &Window::requestUpdate);
connect(m_quickWindow, &QQuickWindow::sceneGraphInitialized, this, &WindowSingleThreaded::createFbo);
connect(m_quickWindow, &QQuickWindow::sceneGraphInvalidated, this, &WindowSingleThreaded::destroyFbo);
connect(m_renderControl, &QQuickRenderControl::renderRequested, this, &WindowSingleThreaded::requestUpdate);
connect(m_renderControl, &QQuickRenderControl::sceneChanged, this, &WindowSingleThreaded::requestUpdate);
}
Window::~Window()
WindowSingleThreaded::~WindowSingleThreaded()
{
// Make sure the context is current while doing cleanup. Note that we use the
// offscreen surface here because passing 'this' at this point is not safe: the
@ -125,17 +126,16 @@ Window::~Window()
delete m_quickWindow;
delete m_qmlEngine;
delete m_fbo;
delete m_program;
delete m_vbo;
delete m_vao;
m_context->doneCurrent();
delete m_offscreenSurface;
delete m_context;
delete m_cubeRenderer;
}
void Window::createFbo()
void WindowSingleThreaded::createFbo()
{
// The scene graph has been initialized. It is now time to create an FBO and associate
// it with the QQuickWindow.
@ -143,19 +143,41 @@ void Window::createFbo()
m_quickWindow->setRenderTarget(m_fbo);
}
void Window::destroyFbo()
void WindowSingleThreaded::destroyFbo()
{
delete m_fbo;
m_fbo = 0;
}
void Window::requestUpdate()
void WindowSingleThreaded::render()
{
if (!m_context->makeCurrent(m_offscreenSurface))
return;
// Polish, synchronize and render the next frame (into our fbo). In this example
// everything happens on the same thread and therefore all three steps are performed
// in succession from here. In a threaded setup the render() call would happen on a
// separate thread.
m_renderControl->polishItems();
m_renderControl->sync();
m_renderControl->render();
m_quickWindow->resetOpenGLState();
QOpenGLFramebufferObject::bindDefault();
m_quickReady = true;
// Get something onto the screen.
m_cubeRenderer->render(this, m_context, m_quickReady ? m_fbo->texture() : 0);
}
void WindowSingleThreaded::requestUpdate()
{
if (!m_updateTimer.isActive())
m_updateTimer.start();
}
void Window::run()
void WindowSingleThreaded::run()
{
disconnect(m_qmlComponent, SIGNAL(statusChanged(QQmlComponent::Status)), this, SLOT(run()));
@ -190,89 +212,10 @@ void Window::run()
// Initialize the render control and our OpenGL resources.
m_context->makeCurrent(m_offscreenSurface);
m_renderControl->initialize(m_context);
static const char *vertexShaderSource =
"attribute highp vec4 vertex;\n"
"attribute lowp vec2 coord;\n"
"varying lowp vec2 v_coord;\n"
"uniform highp mat4 matrix;\n"
"void main() {\n"
" v_coord = coord;\n"
" gl_Position = matrix * vertex;\n"
"}\n";
static const char *fragmentShaderSource =
"varying lowp vec2 v_coord;\n"
"uniform sampler2D sampler;\n"
"void main() {\n"
" gl_FragColor = vec4(texture2D(sampler, v_coord).rgb, 1.0);\n"
"}\n";
m_program = new QOpenGLShaderProgram;
m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, vertexShaderSource);
m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, fragmentShaderSource);
m_program->bindAttributeLocation("vertex", 0);
m_program->bindAttributeLocation("coord", 1);
m_program->link();
m_matrixLoc = m_program->uniformLocation("matrix");
m_vao = new QOpenGLVertexArrayObject;
m_vao->create();
m_vao->bind();
m_vbo = new QOpenGLBuffer;
m_vbo->create();
m_vbo->bind();
GLfloat v[] = {
-0.5, 0.5, 0.5, 0.5,-0.5,0.5,-0.5,-0.5,0.5,
0.5, -0.5, 0.5, -0.5,0.5,0.5,0.5,0.5,0.5,
-0.5, -0.5, -0.5, 0.5,-0.5,-0.5,-0.5,0.5,-0.5,
0.5, 0.5, -0.5, -0.5,0.5,-0.5,0.5,-0.5,-0.5,
0.5, -0.5, -0.5, 0.5,-0.5,0.5,0.5,0.5,-0.5,
0.5, 0.5, 0.5, 0.5,0.5,-0.5,0.5,-0.5,0.5,
-0.5, 0.5, -0.5, -0.5,-0.5,0.5,-0.5,-0.5,-0.5,
-0.5, -0.5, 0.5, -0.5,0.5,-0.5,-0.5,0.5,0.5,
0.5, 0.5, -0.5, -0.5, 0.5, 0.5, -0.5, 0.5, -0.5,
-0.5, 0.5, 0.5, 0.5, 0.5, -0.5, 0.5, 0.5, 0.5,
-0.5, -0.5, -0.5, -0.5, -0.5, 0.5, 0.5, -0.5, -0.5,
0.5, -0.5, 0.5, 0.5, -0.5, -0.5, -0.5, -0.5, 0.5
};
GLfloat texCoords[] = {
0.0f,0.0f, 1.0f,1.0f, 1.0f,0.0f,
1.0f,1.0f, 0.0f,0.0f, 0.0f,1.0f,
1.0f,1.0f, 1.0f,0.0f, 0.0f,1.0f,
0.0f,0.0f, 0.0f,1.0f, 1.0f,0.0f,
1.0f,1.0f, 1.0f,0.0f, 0.0f,1.0f,
0.0f,0.0f, 0.0f,1.0f, 1.0f,0.0f,
0.0f,0.0f, 1.0f,1.0f, 1.0f,0.0f,
1.0f,1.0f, 0.0f,0.0f, 0.0f,1.0f,
0.0f,1.0f, 1.0f,0.0f, 1.0f,1.0f,
1.0f,0.0f, 0.0f,1.0f, 0.0f,0.0f,
1.0f,0.0f, 1.0f,1.0f, 0.0f,0.0f,
0.0f,1.0f, 0.0f,0.0f, 1.0f,1.0f
};
const int vertexCount = 36;
m_vbo->allocate(sizeof(GLfloat) * vertexCount * 5);
m_vbo->write(0, v, sizeof(GLfloat) * vertexCount * 3);
m_vbo->write(sizeof(GLfloat) * vertexCount * 3, texCoords, sizeof(GLfloat) * vertexCount * 2);
m_vbo->release();
if (m_vao->isCreated())
setupVertexAttribs();
// Must unbind before changing the current context. Hence the absence of
// QOpenGLVertexArrayObject::Binder here.
m_vao->release();
m_context->doneCurrent();
m_quickInitialized = true;
}
void Window::updateSizes()
void WindowSingleThreaded::updateSizes()
{
// Behave like SizeRootObjectToView.
m_rootItem->setWidth(width());
@ -280,40 +223,28 @@ void Window::updateSizes()
m_quickWindow->setGeometry(0, 0, width(), height());
m_proj.setToIdentity();
m_proj.perspective(45, width() / float(height()), 0.01f, 100.0f);
m_cubeRenderer->resize(width(), height());
}
void Window::setupVertexAttribs()
{
m_vbo->bind();
m_program->enableAttributeArray(0);
m_program->enableAttributeArray(1);
m_context->functions()->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
m_context->functions()->glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0,
(const void *)(36 * 3 * sizeof(GLfloat)));
m_vbo->release();
}
void Window::startQuick(const QString &filename)
void WindowSingleThreaded::startQuick(const QString &filename)
{
m_qmlComponent = new QQmlComponent(m_qmlEngine, QUrl(filename));
if (m_qmlComponent->isLoading())
connect(m_qmlComponent, &QQmlComponent::statusChanged, this, &Window::run);
connect(m_qmlComponent, &QQmlComponent::statusChanged, this, &WindowSingleThreaded::run);
else
run();
}
void Window::exposeEvent(QExposeEvent *)
void WindowSingleThreaded::exposeEvent(QExposeEvent *)
{
if (isExposed()) {
render();
m_cubeRenderer->render(this, m_context, m_quickReady ? m_fbo->texture() : 0);
if (!m_quickInitialized)
startQuick(QStringLiteral("qrc:/rendercontrol/demo.qml"));
}
}
void Window::resizeEvent(QResizeEvent *)
void WindowSingleThreaded::resizeEvent(QResizeEvent *)
{
// If this is a resize after the scene is up and running, recreate the fbo and the
// Quick item and scene.
@ -325,71 +256,7 @@ void Window::resizeEvent(QResizeEvent *)
}
}
void Window::updateQuick()
{
if (!m_context->makeCurrent(m_offscreenSurface))
return;
// Polish, synchronize and render the next frame (into our fbo). In this example
// everything happens on the same thread and therefore all three steps are performed
// in succession from here. In a threaded setup the render() call would happen on a
// separate thread.
m_renderControl->polishItems();
m_renderControl->sync();
m_renderControl->render();
m_quickWindow->resetOpenGLState();
QOpenGLFramebufferObject::bindDefault();
m_quickReady = true;
// Get something onto the screen.
render();
}
void Window::render()
{
if (!m_context->makeCurrent(this))
return;
QOpenGLFunctions *f = m_context->functions();
f->glClearColor(0.0f, 0.1f, 0.25f, 1.0f);
f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
if (m_quickReady) {
f->glFrontFace(GL_CW); // because our cube's vertex data is such
f->glEnable(GL_CULL_FACE);
f->glEnable(GL_DEPTH_TEST);
f->glBindTexture(GL_TEXTURE_2D, m_fbo->texture());
m_program->bind();
QOpenGLVertexArrayObject::Binder vaoBinder(m_vao);
// If VAOs are not supported, set the vertex attributes every time.
if (!m_vao->isCreated())
setupVertexAttribs();
static GLfloat angle = 0;
QMatrix4x4 m;
m.translate(0, 0, -2);
m.rotate(90, 0, 0, 1);
m.rotate(angle, 0.5, 1, 0);
angle += 0.5f;
m_program->setUniformValue(m_matrixLoc, m_proj * m);
// Draw the cube.
f->glDrawArrays(GL_TRIANGLES, 0, 36);
m_program->release();
f->glDisable(GL_DEPTH_TEST);
f->glDisable(GL_CULL_FACE);
}
m_context->swapBuffers(this);
}
void Window::mousePressEvent(QMouseEvent *e)
void WindowSingleThreaded::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
@ -399,7 +266,7 @@ void Window::mousePressEvent(QMouseEvent *e)
QCoreApplication::sendEvent(m_quickWindow, &mappedEvent);
}
void Window::mouseReleaseEvent(QMouseEvent *e)
void WindowSingleThreaded::mouseReleaseEvent(QMouseEvent *e)
{
QMouseEvent mappedEvent(e->type(), e->localPos(), e->screenPos(), e->button(), e->buttons(), e->modifiers());
QCoreApplication::sendEvent(m_quickWindow, &mappedEvent);

27
examples/quick/rendercontrol/window.h → examples/quick/rendercontrol/window_singlethreaded.h
View File

@ -38,15 +38,15 @@
**
****************************************************************************/
#ifndef WINDOW_SINGLETHREADED_H
#define WINDOW_SINGLETHREADED_H
#include <QWindow>
#include <QMatrix4x4>
#include <QTimer>
QT_FORWARD_DECLARE_CLASS(QOpenGLContext)
QT_FORWARD_DECLARE_CLASS(QOpenGLFramebufferObject)
QT_FORWARD_DECLARE_CLASS(QOpenGLShaderProgram)
QT_FORWARD_DECLARE_CLASS(QOpenGLBuffer)
QT_FORWARD_DECLARE_CLASS(QOpenGLVertexArrayObject)
QT_FORWARD_DECLARE_CLASS(QOffscreenSurface)
QT_FORWARD_DECLARE_CLASS(QQuickRenderControl)
QT_FORWARD_DECLARE_CLASS(QQuickWindow)
@ -54,13 +54,15 @@ QT_FORWARD_DECLARE_CLASS(QQmlEngine)
QT_FORWARD_DECLARE_CLASS(QQmlComponent)
QT_FORWARD_DECLARE_CLASS(QQuickItem)
class Window : public QWindow
class CubeRenderer;
class WindowSingleThreaded : public QWindow
{
Q_OBJECT
public:
Window();
~Window();
WindowSingleThreaded();
~WindowSingleThreaded();
protected:
void exposeEvent(QExposeEvent *e) Q_DECL_OVERRIDE;
@ -69,16 +71,15 @@ protected:
void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
private slots:
void render();
void updateQuick();
void run();
void createFbo();
void destroyFbo();
void render();
void requestUpdate();
private:
void startQuick(const QString &filename);
void setupVertexAttribs();
void updateSizes();
QOpenGLContext *m_context;
@ -89,12 +90,10 @@ private:
QQmlComponent *m_qmlComponent;
QQuickItem *m_rootItem;
QOpenGLFramebufferObject *m_fbo;
QOpenGLShaderProgram *m_program;
QOpenGLBuffer *m_vbo;
QOpenGLVertexArrayObject *m_vao;
bool m_quickInitialized;
bool m_quickReady;
int m_matrixLoc;
QMatrix4x4 m_proj;
QTimer m_updateTimer;
CubeRenderer *m_cubeRenderer;
};
#endif

16
src/quick/items/qquickrendercontrol.cpp
View File

@ -36,7 +36,7 @@
#include <QtCore/QCoreApplication>
#include <QtCore/QTime>
#include <QtCore/private/qabstractanimation_p.h>
#include <QtQuick/private/qquickanimatorcontroller_p.h>
#include <QtGui/QOpenGLContext>
#include <QtGui/private/qguiapplication_p.h>
@ -169,6 +169,20 @@ void QQuickRenderControlPrivate::windowDestroyed()
}
}
/*!
Prepares rendering the Qt Quick scene outside the gui thread.
\a targetThread specifies the thread on which synchronization and
rendering will happen. There is no need to call this function in a
single threaded scenario.
*/
void QQuickRenderControl::prepareThread(QThread *targetThread)
{
Q_D(QQuickRenderControl);
d->rc->moveToThread(targetThread);
QQuickWindowPrivate::get(d->window)->animationController->moveToThread(targetThread);
}
/*!
Initializes the scene graph resources. The context \a gl has to
be the current context.

2
src/quick/items/qquickrendercontrol.h
View File

@ -42,6 +42,7 @@ QT_BEGIN_NAMESPACE
class QQuickWindow;
class QOpenGLContext;
class QQuickRenderControlPrivate;
class QThread;
class Q_QUICK_EXPORT QQuickRenderControl : public QObject
{
@ -51,6 +52,7 @@ public:
QQuickRenderControl(QObject *parent = 0);
~QQuickRenderControl();
void prepareThread(QThread *targetThread);
void initialize(QOpenGLContext *gl);
void invalidate();