05fc3aef53
Replace the current license disclaimer in files by a SPDX-License-Identifier. Files that have to be modified by hand are modified. License files are organized under LICENSES directory. Task-number: QTBUG-67283 Change-Id: Id880c92784c40f3bbde861c0d93f58151c18b9f1 Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Lars Knoll <lars.knoll@qt.io> Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>
113 lines
3.7 KiB
C++
113 lines
3.7 KiB
C++
// Copyright (C) 2020 The Qt Company Ltd.
|
|
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
|
|
|
|
// This is a compact, minimal demo of deciding the backend at runtime while
|
|
// using the exact same shaders and rendering code without any branching
|
|
// whatsoever once the QWindow is up and the RHI is initialized.
|
|
|
|
#include <QGuiApplication>
|
|
#include <QCommandLineParser>
|
|
#include "hellowindow.h"
|
|
|
|
QString graphicsApiName(QRhi::Implementation graphicsApi)
|
|
{
|
|
switch (graphicsApi) {
|
|
case QRhi::Null:
|
|
return QLatin1String("Null (no output)");
|
|
case QRhi::OpenGLES2:
|
|
return QLatin1String("OpenGL 2.x");
|
|
case QRhi::Vulkan:
|
|
return QLatin1String("Vulkan");
|
|
case QRhi::D3D11:
|
|
return QLatin1String("Direct3D 11");
|
|
case QRhi::Metal:
|
|
return QLatin1String("Metal");
|
|
default:
|
|
break;
|
|
}
|
|
return QString();
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
QGuiApplication app(argc, argv);
|
|
|
|
QRhi::Implementation graphicsApi;
|
|
#if defined(Q_OS_WIN)
|
|
graphicsApi = QRhi::D3D11;
|
|
#elif defined(Q_OS_MACOS) || defined(Q_OS_IOS)
|
|
graphicsApi = QRhi::Metal;
|
|
#elif QT_CONFIG(vulkan)
|
|
graphicsApi = QRhi::Vulkan;
|
|
#else
|
|
graphicsApi = QRhi::OpenGLES2;
|
|
#endif
|
|
|
|
QCommandLineParser cmdLineParser;
|
|
cmdLineParser.addHelpOption();
|
|
QCommandLineOption nullOption({ "n", "null" }, QLatin1String("Null"));
|
|
cmdLineParser.addOption(nullOption);
|
|
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(nullOption))
|
|
graphicsApi = QRhi::Null;
|
|
if (cmdLineParser.isSet(glOption))
|
|
graphicsApi = QRhi::OpenGLES2;
|
|
if (cmdLineParser.isSet(vkOption))
|
|
graphicsApi = QRhi::Vulkan;
|
|
if (cmdLineParser.isSet(d3dOption))
|
|
graphicsApi = QRhi::D3D11;
|
|
if (cmdLineParser.isSet(mtlOption))
|
|
graphicsApi = QRhi::Metal;
|
|
|
|
qDebug("Selected graphics API is %s", qPrintable(graphicsApiName(graphicsApi)));
|
|
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)
|
|
QVulkanInstance inst;
|
|
if (graphicsApi == QRhi::Vulkan) {
|
|
inst.setLayers({ "VK_LAYER_KHRONOS_validation" });
|
|
inst.setExtensions(QRhiVulkanInitParams::preferredInstanceExtensions());
|
|
if (!inst.create()) {
|
|
qWarning("Failed to create Vulkan instance, switching to OpenGL");
|
|
graphicsApi = QRhi::OpenGLES2;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
HelloWindow w(graphicsApi);
|
|
#if QT_CONFIG(vulkan)
|
|
if (graphicsApi == QRhi::Vulkan)
|
|
w.setVulkanInstance(&inst);
|
|
#endif
|
|
w.resize(1280, 720);
|
|
w.setTitle(QCoreApplication::applicationName() + QLatin1String(" - ") + graphicsApiName(graphicsApi));
|
|
w.show();
|
|
|
|
int ret = app.exec();
|
|
|
|
// Window::event() will not get invoked when the
|
|
// PlatformSurfaceAboutToBeDestroyed event is sent during the QWindow
|
|
// destruction. That happens only when exiting via app::quit() instead of
|
|
// the more common QWindow::close(). Take care of it: if the QPlatformWindow
|
|
// is still around (there was no close() yet), get rid of the swapchain
|
|
// while it's not too late.
|
|
if (w.handle())
|
|
w.releaseSwapChain();
|
|
|
|
return ret;
|
|
}
|