Commit 4cafb6e7 authored by Laszlo Agocs's avatar Laszlo Agocs
Browse files

Add multiwindow example

parent b6eb196a
......@@ -154,6 +154,7 @@ void Window::customRender()
if (d.initialUpdates) {
u->merge(d.initialUpdates);
d.initialUpdates->release();
d.initialUpdates = nullptr;
}
......
......@@ -219,6 +219,7 @@ void Window::customRender()
QRhiResourceUpdateBatch *u = m_r->nextResourceUpdateBatch();
if (d.initialUpdates) {
u->merge(d.initialUpdates);
d.initialUpdates->release();
d.initialUpdates = nullptr;
}
......
/****************************************************************************
**
** 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 <QVBoxLayout>
#include <QCommandLineParser>
#include <QWindow>
#include <QPlatformSurfaceEvent>
#include <QElapsedTimer>
#include <QBakedShader>
#include <QFile>
#ifndef QT_NO_OPENGL
#include <QRhiGles2InitParams>
#include <QOpenGLContext>
#include <QOffscreenSurface>
#endif
#if QT_CONFIG(vulkan)
#include <QLoggingCategory>
#include <QRhiVulkanInitParams>
#endif
#ifdef Q_OS_WIN
#include <QRhiD3D11InitParams>
#endif
#ifdef Q_OS_DARWIN
#include <QRhiMetalInitParams>
#endif
enum GraphicsApi
{
OpenGL,
Vulkan,
D3D11,
Metal
};
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();
}
static struct {
#if QT_CONFIG(vulkan)
QVulkanInstance *instance = nullptr;
#endif
QRhi *r = nullptr;
#ifndef QT_NO_OPENGL
QOpenGLContext *context = nullptr;
QOffscreenSurface *fallbackSurface = nullptr;
#endif
} r;
void createRhi()
{
#ifndef QT_NO_OPENGL
if (graphicsApi == OpenGL) {
r.context = new QOpenGLContext;
if (!r.context->create())
qFatal("Failed to get OpenGL context");
r.fallbackSurface = new QOffscreenSurface;
r.fallbackSurface->setFormat(r.context->format());
r.fallbackSurface->create();
QRhiGles2InitParams params;
params.context = r.context;
//params.window = this;
params.fallbackSurface = r.fallbackSurface;
r.r = QRhi::create(QRhi::OpenGLES2, &params);
}
#endif
#if QT_CONFIG(vulkan)
if (graphicsApi == Vulkan) {
QRhiVulkanInitParams params;
params.inst = r.instance;
//params.window = this;
r.r = QRhi::create(QRhi::Vulkan, &params);
}
#endif
#ifdef Q_OS_WIN
if (graphicsApi == D3D11) {
QRhiD3D11InitParams params;
r.r = QRhi::create(QRhi::D3D11, &params);
}
#endif
#ifdef Q_OS_DARWIN
if (graphicsApi == Metal) {
QRhiMetalInitParams params;
r.r = QRhi::create(QRhi::Metal, &params);
}
#endif
if (!r.r)
qFatal("Failed to create RHI backend");
}
void destroyRhi()
{
delete r.r;
#ifndef QT_NO_OPENGL
delete r.context;
delete r.fallbackSurface;
#endif
}
struct {
QVector<QWindow *> windows;
QRhiBuffer *vbuf = nullptr;
QRhiBuffer *ubuf = nullptr;
QRhiShaderResourceBindings *srb = nullptr;
QRhiGraphicsPipeline *ps = nullptr;
QRhiResourceUpdateBatch *initialUpdates = nullptr;
} d;
static float vertexData[] = {
0.0f, 0.5f, 1.0f, 0.0f, 0.0f,
-0.5f, -0.5f, 0.0f, 1.0f, 0.0f,
0.5f, -0.5f, 0.0f, 0.0f, 1.0f,
};
static QBakedShader getShader(const QString &name)
{
QFile f(name);
if (f.open(QIODevice::ReadOnly))
return QBakedShader::fromSerialized(f.readAll());
return QBakedShader();
}
// can use just one rpd from whichever window comes first since they are
// actually compatible due to all windows using the same config (have
// depth-stencil, sample count 1, same format). this means the same pso can be
// reused too.
void ensureSharedResources(QRhiRenderPassDescriptor *rp)
{
if (!d.vbuf) {
d.vbuf = r.r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(vertexData));
d.vbuf->build();
d.initialUpdates = r.r->nextResourceUpdateBatch();
d.initialUpdates->uploadStaticBuffer(d.vbuf, vertexData);
}
if (!d.ubuf) {
d.ubuf = r.r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 68);
d.ubuf->build();
}
if (!d.srb) {
d.srb = r.r->newShaderResourceBindings();
d.srb->setBindings({
QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage, d.ubuf)
});
d.srb->build();
}
if (!d.ps) {
d.ps = r.r->newGraphicsPipeline();
QRhiGraphicsPipeline::TargetBlend premulAlphaBlend;
premulAlphaBlend.enable = true;
d.ps->setTargetBlends({ premulAlphaBlend });
const QBakedShader vs = getShader(QLatin1String(":/color.vert.qsb"));
if (!vs.isValid())
qFatal("Failed to load shader pack (vertex)");
const QBakedShader fs = getShader(QLatin1String(":/color.frag.qsb"));
if (!fs.isValid())
qFatal("Failed to load shader pack (fragment)");
d.ps->setShaderStages({
{ QRhiGraphicsShaderStage::Vertex, vs },
{ QRhiGraphicsShaderStage::Fragment, fs }
});
QRhiVertexInputLayout inputLayout;
inputLayout.bindings = {
{ 5 * sizeof(float) }
};
inputLayout.attributes = {
{ 0, 0, QRhiVertexInputLayout::Attribute::Float2, 0 },
{ 0, 1, QRhiVertexInputLayout::Attribute::Float3, 2 * sizeof(float) }
};
d.ps->setVertexInputLayout(inputLayout);
d.ps->setShaderResourceBindings(d.srb);
d.ps->setRenderPassDescriptor(rp);
d.ps->build();
}
}
void destroySharedResources()
{
if (d.ps) {
d.ps->releaseAndDestroy();
d.ps = nullptr;
}
if (d.srb) {
d.srb->releaseAndDestroy();
d.srb = nullptr;
}
if (d.vbuf) {
d.vbuf->releaseAndDestroy();
d.vbuf = nullptr;
}
if (d.ubuf) {
d.ubuf->releaseAndDestroy();
d.ubuf = nullptr;
}
}
class Window : public QWindow
{
public:
Window(const QString &title, const QColor &bgColor, int axis);
~Window();
protected:
void init();
void releaseResources();
void resizeSwapChain();
void releaseSwapChain();
void render();
void exposeEvent(QExposeEvent *) override;
bool event(QEvent *) override;
QColor m_bgColor;
int m_rotationAxis = 0;
bool m_running = false;
bool m_notExposed = false;
bool m_newlyExposed = false;
QMatrix4x4 m_proj;
QVector<QRhiResource *> m_releasePool;
bool m_hasSwapChain = false;
QRhiSwapChain *m_sc = nullptr;
QRhiRenderBuffer *m_ds = nullptr;
QRhiRenderPassDescriptor *m_rp = nullptr;
float m_rotation = 0;
float m_opacity = 1;
int m_opacityDir = -1;
};
Window::Window(const QString &title, const QColor &bgColor, int axis)
: m_bgColor(bgColor),
m_rotationAxis(axis)
{
switch (graphicsApi) {
case OpenGL:
setSurfaceType(OpenGLSurface);
break;
case Vulkan:
setSurfaceType(VulkanSurface);
setVulkanInstance(r.instance);
break;
case D3D11:
setSurfaceType(OpenGLSurface); // not a typo
break;
case Metal:
#if (QT_VERSION >= QT_VERSION_CHECK(5, 12, 0))
setSurfaceType(MetalSurface);
#endif
break;
default:
break;
}
resize(800, 600);
setTitle(title);
}
Window::~Window()
{
releaseResources();
}
void Window::exposeEvent(QExposeEvent *)
{
// initialize and start rendering when the window becomes usable for graphics purposes
if (isExposed() && !m_running) {
m_running = true;
init();
resizeSwapChain();
render();
}
// stop pushing frames when not exposed (on some platforms this is essential, optional on others)
if (!isExposed() && m_running)
m_notExposed = true;
// continue when exposed again
if (isExposed() && m_running && m_notExposed) {
m_notExposed = false;
m_newlyExposed = true;
render();
}
}
bool Window::event(QEvent *e)
{
switch (e->type()) {
case QEvent::UpdateRequest:
render();
break;
case QEvent::PlatformSurface:
// this is the proper time to tear down the swapchain (while the native window and surface are still around)
if (static_cast<QPlatformSurfaceEvent *>(e)->surfaceEventType() == QPlatformSurfaceEvent::SurfaceAboutToBeDestroyed)
releaseSwapChain();
break;
default:
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::ToBeUsedWithSwapChainOnly);
m_releasePool << m_ds;
m_sc->setWindow(this);
m_sc->setDepthStencil(m_ds);
m_rp = m_sc->newCompatibleRenderPassDescriptor();
m_releasePool << m_rp;
m_sc->setRenderPassDescriptor(m_rp);
ensureSharedResources(m_rp);
}
void Window::releaseResources()
{
for (QRhiResource *res : m_releasePool)
res->releaseAndDestroy();
m_releasePool.clear();
delete m_sc;
}
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(),
{ 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->setVertexInput(0, { { d.vbuf, 0 } });
cb->draw(3);
cb->endPass();
r.r->endFrame(m_sc);
requestUpdate();
}
void createWindow()
{
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", n), colors[n % 6], n % 3));
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()));
QSurfaceFormat fmt;
fmt.setDepthBufferSize(24);
fmt.setStencilBufferSize(8);
QSurfaceFormat::setDefaultFormat(fmt);
#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(