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/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, 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 The Qt Company Ltd 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 <QApplication>
#include <QWidget>
#include <QLabel>
#include <QPlainTextEdit>
#include <QPushButton>
#include <QCheckBox>
#include <QVBoxLayout>
#include <QThread>
#include <QMutex>
#include <QWaitCondition>
#include <QQueue>
#include <QEvent>
#include <QCommandLineParser>
#include <QElapsedTimer>
#include <QtGui/private/qshader_p.h>
#include <QFile>
#include <QtGui/private/qrhiprofiler_p.h>
#ifndef QT_NO_OPENGL
#include <QtGui/private/qrhigles2_p.h>
#include <QOffscreenSurface>
#endif
#if QT_CONFIG(vulkan)
#include <QLoggingCategory>
#include <QtGui/private/qrhivulkan_p.h>
#endif
#ifdef Q_OS_WIN
#include <QtGui/private/qrhid3d11_p.h>
#endif
#if defined(Q_OS_MACOS) || defined(Q_OS_IOS)
#include <QtGui/private/qrhimetal_p.h>
#endif
#include "window.h"
#include "../shared/cube.h"
static QShader getShader(const QString &name)
{
QFile f(name);
if (f.open(QIODevice::ReadOnly))
return QShader::fromSerialized(f.readAll());
return QShader();
}
static GraphicsApi graphicsApi;
static QString graphicsApiName()
{
switch (graphicsApi) {
case OpenGL:
return QLatin1String("OpenGL 2.x");
case Vulkan:
return QLatin1String("Vulkan");
case D3D11:
return QLatin1String("Direct3D 11");
case Metal:
return QLatin1String("Metal");
default:
break;
}
return QString();
}
#if QT_CONFIG(vulkan)
QVulkanInstance *instance = nullptr;
#endif
// Window (main thread) emit signals -> Renderer::send* (main thread) -> event queue (add on main, process on render thread) -> Renderer::renderEvent (render thread)
// event queue is taken from the Qt Quick scenegraph as-is
// all this below is conceptually the same as the QSG threaded render loop
class RenderThreadEventQueue : public QQueue<QEvent *>
{
public:
RenderThreadEventQueue()
: waiting(false)
{
}
void addEvent(QEvent *e) {
mutex.lock();
enqueue(e);
if (waiting)
condition.wakeOne();
mutex.unlock();
}
QEvent *takeEvent(bool wait) {
mutex.lock();
if (isEmpty() && wait) {
waiting = true;
condition.wait(&mutex);
waiting = false;
}
QEvent *e = dequeue();
mutex.unlock();
return e;
}
bool hasMoreEvents() {
mutex.lock();
bool has = !isEmpty();
mutex.unlock();
return has;
}
private:
QMutex mutex;
QWaitCondition condition;
bool waiting;
};
struct Renderer;
struct Thread : public QThread
{
Thread(Renderer *renderer_)
: renderer(renderer_)
{
active = true;
start();
}
void run() override;
Renderer *renderer;
bool active;
RenderThreadEventQueue eventQueue;
bool sleeping = false;
bool stopEventProcessing = false;
bool pendingRender = false;
bool pendingRenderIsNewExpose = false;
// mutex and cond used to allow the main thread waiting until something completes on the render thread
QMutex mutex;
QWaitCondition cond;
};
class RenderThreadEvent : public QEvent
{
public:
RenderThreadEvent(QEvent::Type type) : QEvent(type) { }
};
class InitEvent : public RenderThreadEvent
{
public:
static const QEvent::Type TYPE = QEvent::Type(QEvent::User + 1);
InitEvent() : RenderThreadEvent(TYPE)
{ }
};
class RequestRenderEvent : public RenderThreadEvent
{
public:
static const QEvent::Type TYPE = QEvent::Type(QEvent::User + 2);
RequestRenderEvent(bool newlyExposed_) : RenderThreadEvent(TYPE), newlyExposed(newlyExposed_)
{ }
bool newlyExposed;
};
class SurfaceCleanupEvent : public RenderThreadEvent
{
public:
static const QEvent::Type TYPE = QEvent::Type(QEvent::User + 3);
SurfaceCleanupEvent() : RenderThreadEvent(TYPE)
{ }
};
class CloseEvent : public RenderThreadEvent
{
public:
static const QEvent::Type TYPE = QEvent::Type(QEvent::User + 4);
CloseEvent() : RenderThreadEvent(TYPE)
{ }
};
class SyncSurfaceSizeEvent : public RenderThreadEvent
{
public:
static const QEvent::Type TYPE = QEvent::Type(QEvent::User + 5);
SyncSurfaceSizeEvent() : RenderThreadEvent(TYPE)
{ }
};
struct Renderer
{
// ctor and dtor and send* are called main thread, rest on the render thread
Renderer(QWindow *w, const QColor &bgColor, int rotationAxis);
~Renderer();
void sendInit();
void sendRender(bool newlyExposed);
void sendSurfaceGoingAway();
void sendSyncSurfaceSize();
QWindow *window;
Thread *thread;
QRhi *r = nullptr;
#ifndef QT_NO_OPENGL
QOffscreenSurface *fallbackSurface = nullptr;
#endif
void createRhi();
void destroyRhi();
void renderEvent(QEvent *e);
void init();
void releaseSwapChain();
void releaseResources();
void render(bool newlyExposed, bool wakeBeforePresent);
QColor m_bgColor;
int m_rotationAxis;
QVector<QRhiResource *> m_releasePool;
bool m_hasSwapChain = false;
QRhiSwapChain *m_sc = nullptr;
QRhiRenderBuffer *m_ds = nullptr;
QRhiRenderPassDescriptor *m_rp = nullptr;
QRhiBuffer *m_vbuf = nullptr;
QRhiBuffer *m_ubuf = nullptr;
QRhiTexture *m_tex = nullptr;
QRhiSampler *m_sampler = nullptr;
QRhiShaderResourceBindings *m_srb = nullptr;
QRhiGraphicsPipeline *m_ps = nullptr;
QRhiResourceUpdateBatch *m_initialUpdates = nullptr;
QMatrix4x4 m_proj;
float m_rotation = 0;
int m_frameCount = 0;
};
void Thread::run()
{
while (active) {
#ifdef Q_OS_DARWIN
QMacAutoReleasePool autoReleasePool;
#endif
if (pendingRender) {
pendingRender = false;
renderer->render(pendingRenderIsNewExpose, false);
}
while (eventQueue.hasMoreEvents()) {
QEvent *e = eventQueue.takeEvent(false);
renderer->renderEvent(e);
delete e;
}
if (active && !pendingRender) {
sleeping = true;
stopEventProcessing = false;
while (!stopEventProcessing) {
QEvent *e = eventQueue.takeEvent(true);
renderer->renderEvent(e);
delete e;
}
sleeping = false;
}
}
}
Renderer::Renderer(QWindow *w, const QColor &bgColor, int rotationAxis)
: window(w),
m_bgColor(bgColor),
m_rotationAxis(rotationAxis)
{ // main thread
thread = new Thread(this);
#ifndef QT_NO_OPENGL
if (graphicsApi == OpenGL)
fallbackSurface = QRhiGles2InitParams::newFallbackSurface();
#endif
}
Renderer::~Renderer()
{ // main thread
thread->eventQueue.addEvent(new CloseEvent);
thread->wait();
delete thread;
#ifndef QT_NO_OPENGL
delete fallbackSurface;
#endif
}
void Renderer::createRhi()
{
if (r)
return;
qDebug() << "renderer" << this << "creating rhi";
QRhi::Flags rhiFlags = QRhi::EnableProfiling;
#ifndef QT_NO_OPENGL
if (graphicsApi == OpenGL) {
QRhiGles2InitParams params;
params.fallbackSurface = fallbackSurface;
params.window = window;
r = QRhi::create(QRhi::OpenGLES2, ¶ms, rhiFlags);
}
#endif
#if QT_CONFIG(vulkan)
if (graphicsApi == Vulkan) {
QRhiVulkanInitParams params;
params.inst = instance;
params.window = window;
r = QRhi::create(QRhi::Vulkan, ¶ms, rhiFlags);
}
#endif
#ifdef Q_OS_WIN
if (graphicsApi == D3D11) {
QRhiD3D11InitParams params;
params.enableDebugLayer = true;
r = QRhi::create(QRhi::D3D11, ¶ms, rhiFlags);
}
#endif
#if defined(Q_OS_MACOS) || defined(Q_OS_IOS)
if (graphicsApi == Metal) {
QRhiMetalInitParams params;
r = QRhi::create(QRhi::Metal, ¶ms, rhiFlags);
}
#endif
if (!r)
qFatal("Failed to create RHI backend");
}
void Renderer::destroyRhi()
{
qDebug() << "renderer" << this << "destroying rhi";
delete r;
r = nullptr;
}
void Renderer::renderEvent(QEvent *e)
{
Q_ASSERT(QThread::currentThread() == thread);
if (thread->sleeping)
thread->stopEventProcessing = true;
switch (int(e->type())) {
case InitEvent::TYPE:
qDebug() << "renderer" << this << "for window" << window << "is initializing";
createRhi();
init();
break;
case RequestRenderEvent::TYPE:
thread->pendingRender = true;
thread->pendingRenderIsNewExpose = static_cast<RequestRenderEvent *>(e)->newlyExposed;
break;
case SurfaceCleanupEvent::TYPE: // when the QWindow is closed, before QPlatformWindow goes away
thread->mutex.lock();
qDebug() << "renderer" << this << "for window" << window << "is destroying swapchain";
thread->pendingRender = false;
releaseSwapChain();
thread->cond.wakeOne();
thread->mutex.unlock();
break;
case CloseEvent::TYPE: // when destroying the window+renderer (NB not the same as hitting X on the window, that's just QWindow close)
qDebug() << "renderer" << this << "for window" << window << "is shutting down";
thread->pendingRender = false;
thread->active = false;
thread->stopEventProcessing = true;
releaseResources();
destroyRhi();
break;
case SyncSurfaceSizeEvent::TYPE:
thread->mutex.lock();
thread->pendingRender = false;
render(false, true);
break;
default:
break;
}
}
void Renderer::init()
{
m_sc = r->newSwapChain();
m_ds = r->newRenderBuffer(QRhiRenderBuffer::DepthStencil,
QSize(),
1,
QRhiRenderBuffer::UsedWithSwapChainOnly);
m_releasePool << m_ds;
m_sc->setWindow(window);
m_sc->setDepthStencil(m_ds);
m_rp = m_sc->newCompatibleRenderPassDescriptor();
m_releasePool << m_rp;
m_sc->setRenderPassDescriptor(m_rp);
m_vbuf = r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(cube));
m_releasePool << m_vbuf;
m_vbuf->build();
m_ubuf = r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 64 + 4);
m_releasePool << m_ubuf;
m_ubuf->build();
QImage image = QImage(QLatin1String(":/qt256.png")).convertToFormat(QImage::Format_RGBA8888);
m_tex = r->newTexture(QRhiTexture::RGBA8, image.size());
m_releasePool << m_tex;
m_tex->build();
m_sampler = r->newSampler(QRhiSampler::Linear, QRhiSampler::Linear, QRhiSampler::None,
QRhiSampler::ClampToEdge, QRhiSampler::ClampToEdge);
m_releasePool << m_sampler;
m_sampler->build();
m_srb = r->newShaderResourceBindings();
m_releasePool << m_srb;
m_srb->setBindings({
QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage, m_ubuf),
QRhiShaderResourceBinding::sampledTexture(1, QRhiShaderResourceBinding::FragmentStage, m_tex, m_sampler)
});
m_srb->build();
m_ps = r->newGraphicsPipeline();
m_releasePool << m_ps;
m_ps->setDepthTest(true);
m_ps->setDepthWrite(true);
m_ps->setDepthOp(QRhiGraphicsPipeline::Less);
m_ps->setCullMode(QRhiGraphicsPipeline::Back);
m_ps->setFrontFace(QRhiGraphicsPipeline::CCW);
m_ps->setShaderStages({
{ QRhiShaderStage::Vertex, getShader(QLatin1String(":/texture.vert.qsb")) },
{ QRhiShaderStage::Fragment, getShader(QLatin1String(":/texture.frag.qsb")) }
});
QRhiVertexInputLayout inputLayout;
inputLayout.setBindings({
{ 3 * sizeof(float) },
{ 2 * sizeof(float) }
});
inputLayout.setAttributes({
{ 0, 0, QRhiVertexInputAttribute::Float3, 0 },
{ 1, 1, QRhiVertexInputAttribute::Float2, 0 }
});
m_ps->setVertexInputLayout(inputLayout);
m_ps->setShaderResourceBindings(m_srb);
m_ps->setRenderPassDescriptor(m_rp);
m_ps->build();
m_initialUpdates = r->nextResourceUpdateBatch();
m_initialUpdates->uploadStaticBuffer(m_vbuf, cube);
qint32 flip = 0;
m_initialUpdates->updateDynamicBuffer(m_ubuf, 64, 4, &flip);
m_initialUpdates->uploadTexture(m_tex, image);
}
void Renderer::releaseSwapChain()
{
if (m_hasSwapChain) {
m_hasSwapChain = false;
m_sc->release();
}
}
void Renderer::releaseResources()
{
qDeleteAll(m_releasePool);
m_releasePool.clear();
delete m_sc;
m_sc = nullptr;
}
void Renderer::render(bool newlyExposed, bool wakeBeforePresent)
{
// This function handles both resizing and rendering. Resizes have some
// complications due to the threaded model (check exposeEvent and
// sendSyncSurfaceSize) but don't have to worry about that in here.
auto buildOrResizeSwapChain = [this] {
qDebug() << "renderer" << this << "build or resize swapchain for window" << window;
m_hasSwapChain = m_sc->buildOrResize();
const QSize outputSize = m_sc->currentPixelSize();
qDebug() << " size is" << outputSize;
m_proj = r->clipSpaceCorrMatrix();
m_proj.perspective(45.0f, outputSize.width() / (float) outputSize.height(), 0.01f, 100.0f);
m_proj.translate(0, 0, -4);
};
auto wakeUpIfNeeded = [wakeBeforePresent, this] {
// make sure the main/gui thread is not blocked when issuing the Present (or equivalent)
if (wakeBeforePresent) {
thread->cond.wakeOne();
thread->mutex.unlock();
}
};
const QSize surfaceSize = m_sc->surfacePixelSize();
if (surfaceSize.isEmpty()) {
wakeUpIfNeeded();
return;
}
if (newlyExposed || m_sc->currentPixelSize() != surfaceSize)
buildOrResizeSwapChain();
if (!m_hasSwapChain) {
wakeUpIfNeeded();
return;
}
QRhi::FrameOpResult result = r->beginFrame(m_sc);
if (result == QRhi::FrameOpSwapChainOutOfDate) {
buildOrResizeSwapChain();
if (!m_hasSwapChain) {
wakeUpIfNeeded();
return;
}
result = r->beginFrame(m_sc);
}
if (result != QRhi::FrameOpSuccess) {
wakeUpIfNeeded();
return;
}
QRhiCommandBuffer *cb = m_sc->currentFrameCommandBuffer();
const QSize outputSize = m_sc->currentPixelSize();
QRhiResourceUpdateBatch *u = r->nextResourceUpdateBatch();
if (m_initialUpdates) {
u->merge(m_initialUpdates);
m_initialUpdates->release();
m_initialUpdates = nullptr;
}
m_rotation += 1.0f;
QMatrix4x4 mvp = m_proj;
mvp.scale(0.5f);
mvp.rotate(m_rotation, m_rotationAxis == 0 ? 1 : 0, m_rotationAxis == 1 ? 1 : 0, m_rotationAxis == 2 ? 1 : 0);
u->updateDynamicBuffer(m_ubuf, 0, 64, mvp.constData());
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(m_ps);
cb->setViewport(QRhiViewport(0, 0, outputSize.width(), outputSize.height()));
cb->setShaderResources();
const QRhiCommandBuffer::VertexInput vbufBindings[] = {
{ m_vbuf, 0 },
{ m_vbuf, 36 * 3 * sizeof(float) }
};
cb->setVertexInput(0, 2, vbufBindings);
cb->draw(36);
cb->endPass();
wakeUpIfNeeded();
r->endFrame(m_sc);
m_frameCount += 1;
if ((m_frameCount % 300) == 0) {
const QRhiProfiler::CpuTime ff = r->profiler()->frameToFrameTimes(m_sc);
const QRhiProfiler::CpuTime be = r->profiler()->frameBuildTimes(m_sc);
const QRhiProfiler::GpuTime gp = r->profiler()->gpuFrameTimes(m_sc);
if (r->isFeatureSupported(QRhi::Timestamps)) {
qDebug("[renderer %p] frame-to-frame: min %lld max %lld avg %f. "
"frame build: min %lld max %lld avg %f. "
"gpu frame time: min %f max %f avg %f",
this,
ff.minTime, ff.maxTime, ff.avgTime,
be.minTime, be.maxTime, be.avgTime,
gp.minTime, gp.maxTime, gp.avgTime);
} else {
qDebug("[renderer %p] frame-to-frame: min %lld max %lld avg %f. "
"frame build: min %lld max %lld avg %f. ",
this,
ff.minTime, ff.maxTime, ff.avgTime,
be.minTime, be.maxTime, be.avgTime);
}
}
}
void Renderer::sendInit()
{ // main thread
InitEvent *e = new InitEvent;
thread->eventQueue.addEvent(e);
}
void Renderer::sendRender(bool newlyExposed)
{ // main thread
RequestRenderEvent *e = new RequestRenderEvent(newlyExposed);
thread->eventQueue.addEvent(e);
}
void Renderer::sendSurfaceGoingAway()
{ // main thread
SurfaceCleanupEvent *e = new SurfaceCleanupEvent;
// cannot let this thread to proceed with tearing down the native window
// before the render thread completes the swapchain release
thread->mutex.lock();
thread->eventQueue.addEvent(e);
thread->cond.wait(&thread->mutex);
thread->mutex.unlock();
}
void Renderer::sendSyncSurfaceSize()
{ // main thread
SyncSurfaceSizeEvent *e = new SyncSurfaceSizeEvent;
// must block to prevent surface size mess. the render thread will do a
// full rendering round before it unlocks which is good since it can thus
// pick up and the surface (window) size atomically.
thread->mutex.lock();
thread->eventQueue.addEvent(e);
thread->cond.wait(&thread->mutex);
thread->mutex.unlock();
}
struct WindowAndRenderer
{
QWindow *window;
Renderer *renderer;
};
QVector<WindowAndRenderer> windows;
void createWindow()
{
static QColor colors[] = { Qt::red, Qt::green, Qt::blue, Qt::yellow, Qt::cyan, Qt::gray };
const int n = windows.count();
Window *w = new Window(QString::asprintf("Window+Thread #%d (%s)", n, qPrintable(graphicsApiName())), graphicsApi);
Renderer *renderer = new Renderer(w, colors[n % 6], n % 3);;
QObject::connect(w, &Window::initRequested, w, [renderer] {
renderer->sendInit();
});
QObject::connect(w, &Window::renderRequested, w, [w, renderer](bool newlyExposed) {
renderer->sendRender(newlyExposed);
w->requestUpdate();
});
QObject::connect(w, &Window::surfaceGoingAway, w, [renderer] {
renderer->sendSurfaceGoingAway();
});
QObject::connect(w, &Window::syncSurfaceSizeRequested, w, [renderer] {
renderer->sendSyncSurfaceSize();
});
windows.append({ w, renderer });
w->show();
}
void closeWindow()
{
WindowAndRenderer wr = windows.takeLast();
delete wr.renderer;
delete wr.window;
}
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_MACOS) || defined(Q_OS_IOS)
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)
instance = new QVulkanInstance;
if (graphicsApi == Vulkan) {
#ifndef Q_OS_ANDROID
instance->setLayers({ "VK_LAYER_LUNARG_standard_validation" });
#else
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 (!instance->create()) {
qWarning("Failed to create Vulkan instance, switching to OpenGL");
graphicsApi = OpenGL;
}
}
#endif
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 on a separate thread per window, with dedicated QRhi instances and resources. "
"\n\nThis is the same concept as the Qt Quick Scenegraph's threaded render loop. This should allow rendering to the different windows "
"without unintentionally throttling each other's threads."
"\n\nUsing API: ") + graphicsApiName());
info->setReadOnly(true);
layout->addWidget(info);
QLabel *label = new QLabel(QLatin1String("Window and thread count: 0"));
layout->addWidget(label);
QPushButton *btn = new QPushButton(QLatin1String("New window"));
QObject::connect(btn, &QPushButton::clicked, btn, [label, &winCount] {
winCount += 1;
label->setText(QString::asprintf("Window count: %d", winCount));
createWindow();
});
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();
for (const WindowAndRenderer &wr : windows) {
delete wr.renderer;
delete wr.window;
}
#if QT_CONFIG(vulkan)
delete instance;
#endif
return result;
}
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