mirror of
https://github.com/crystalidea/qt6windows7.git
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113 lines
3.7 KiB
C++
113 lines
3.7 KiB
C++
// Copyright (C) 2020 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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// This is a compact, minimal demo of deciding the backend at runtime while
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// using the exact same shaders and rendering code without any branching
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// whatsoever once the QWindow is up and the RHI is initialized.
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#include <QGuiApplication>
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#include <QCommandLineParser>
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#include "hellowindow.h"
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QString graphicsApiName(QRhi::Implementation graphicsApi)
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{
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switch (graphicsApi) {
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case QRhi::Null:
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return QLatin1String("Null (no output)");
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case QRhi::OpenGLES2:
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return QLatin1String("OpenGL 2.x");
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case QRhi::Vulkan:
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return QLatin1String("Vulkan");
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case QRhi::D3D11:
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return QLatin1String("Direct3D 11");
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case QRhi::Metal:
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return QLatin1String("Metal");
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default:
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break;
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}
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return QString();
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}
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int main(int argc, char **argv)
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{
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QGuiApplication app(argc, argv);
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QRhi::Implementation graphicsApi;
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#if defined(Q_OS_WIN)
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graphicsApi = QRhi::D3D11;
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#elif defined(Q_OS_MACOS) || defined(Q_OS_IOS)
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graphicsApi = QRhi::Metal;
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#elif QT_CONFIG(vulkan)
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graphicsApi = QRhi::Vulkan;
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#else
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graphicsApi = QRhi::OpenGLES2;
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#endif
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QCommandLineParser cmdLineParser;
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cmdLineParser.addHelpOption();
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QCommandLineOption nullOption({ "n", "null" }, QLatin1String("Null"));
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cmdLineParser.addOption(nullOption);
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QCommandLineOption glOption({ "g", "opengl" }, QLatin1String("OpenGL (2.x)"));
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cmdLineParser.addOption(glOption);
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QCommandLineOption vkOption({ "v", "vulkan" }, QLatin1String("Vulkan"));
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cmdLineParser.addOption(vkOption);
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QCommandLineOption d3dOption({ "d", "d3d11" }, QLatin1String("Direct3D 11"));
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cmdLineParser.addOption(d3dOption);
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QCommandLineOption mtlOption({ "m", "metal" }, QLatin1String("Metal"));
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cmdLineParser.addOption(mtlOption);
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cmdLineParser.process(app);
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if (cmdLineParser.isSet(nullOption))
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graphicsApi = QRhi::Null;
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if (cmdLineParser.isSet(glOption))
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graphicsApi = QRhi::OpenGLES2;
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if (cmdLineParser.isSet(vkOption))
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graphicsApi = QRhi::Vulkan;
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if (cmdLineParser.isSet(d3dOption))
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graphicsApi = QRhi::D3D11;
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if (cmdLineParser.isSet(mtlOption))
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graphicsApi = QRhi::Metal;
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qDebug("Selected graphics API is %s", qPrintable(graphicsApiName(graphicsApi)));
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qDebug("This is a multi-api example, use command line arguments to override:\n%s", qPrintable(cmdLineParser.helpText()));
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QSurfaceFormat fmt;
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fmt.setDepthBufferSize(24);
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fmt.setStencilBufferSize(8);
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QSurfaceFormat::setDefaultFormat(fmt);
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#if QT_CONFIG(vulkan)
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QVulkanInstance inst;
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if (graphicsApi == QRhi::Vulkan) {
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inst.setLayers({ "VK_LAYER_KHRONOS_validation" });
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inst.setExtensions(QRhiVulkanInitParams::preferredInstanceExtensions());
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if (!inst.create()) {
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qWarning("Failed to create Vulkan instance, switching to OpenGL");
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graphicsApi = QRhi::OpenGLES2;
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}
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}
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#endif
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HelloWindow w(graphicsApi);
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#if QT_CONFIG(vulkan)
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if (graphicsApi == QRhi::Vulkan)
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w.setVulkanInstance(&inst);
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#endif
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w.resize(1280, 720);
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w.setTitle(QCoreApplication::applicationName() + QLatin1String(" - ") + graphicsApiName(graphicsApi));
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w.show();
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int ret = app.exec();
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// Window::event() will not get invoked when the
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// PlatformSurfaceAboutToBeDestroyed event is sent during the QWindow
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// destruction. That happens only when exiting via app::quit() instead of
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// the more common QWindow::close(). Take care of it: if the QPlatformWindow
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// is still around (there was no close() yet), get rid of the swapchain
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// while it's not too late.
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if (w.handle())
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w.releaseSwapChain();
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return ret;
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}
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