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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QGuiApplication>
#include <QCommandLineParser>
#include "rhiwindow.h"
int main(int argc, char **argv)
{
QGuiApplication app(argc, argv);
QRhi::Implementation graphicsApi;
// Use platform-specific defaults when no command-line arguments given.
#if defined(Q_OS_WIN)
graphicsApi = QRhi::D3D11;
#elif QT_CONFIG(metal)
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"));
cmdLineParser.addOption(glOption);
QCommandLineOption vkOption({ "v", "vulkan" }, QLatin1String("Vulkan"));
cmdLineParser.addOption(vkOption);
QCommandLineOption d3d11Option({ "d", "d3d11" }, QLatin1String("Direct3D 11"));
cmdLineParser.addOption(d3d11Option);
QCommandLineOption d3d12Option({ "D", "d3d12" }, QLatin1String("Direct3D 12"));
cmdLineParser.addOption(d3d12Option);
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(d3d11Option))
graphicsApi = QRhi::D3D11;
if (cmdLineParser.isSet(d3d12Option))
graphicsApi = QRhi::D3D12;
if (cmdLineParser.isSet(mtlOption))
graphicsApi = QRhi::Metal;
//! [api-setup]
// For OpenGL, to ensure there is a depth/stencil buffer for the window.
// With other APIs this is under the application's control (QRhiRenderBuffer etc.)
// and so no special setup is needed for those.
QSurfaceFormat fmt;
fmt.setDepthBufferSize(24);
fmt.setStencilBufferSize(8);
// Special case macOS to allow using OpenGL there.
// (the default Metal is the recommended approach, though)
// gl_VertexID is a GLSL 130 feature, and so the default OpenGL 2.1 context
// we get on macOS is not sufficient.
#ifdef Q_OS_MACOS
fmt.setVersion(4, 1);
fmt.setProfile(QSurfaceFormat::CoreProfile);
#endif
QSurfaceFormat::setDefaultFormat(fmt);
// For Vulkan.
#if QT_CONFIG(vulkan)
QVulkanInstance inst;
if (graphicsApi == QRhi::Vulkan) {
// Request validation, if available. This is completely optional
// and has a performance impact, and should be avoided in production use.
inst.setLayers({ "VK_LAYER_KHRONOS_validation" });
// Play nice with QRhi.
inst.setExtensions(QRhiVulkanInitParams::preferredInstanceExtensions());
if (!inst.create()) {
qWarning("Failed to create Vulkan instance, switching to OpenGL");
graphicsApi = QRhi::OpenGLES2;
}
}
#endif
//! [api-setup]
HelloWindow window(graphicsApi);
#if QT_CONFIG(vulkan)
if (graphicsApi == QRhi::Vulkan)
window.setVulkanInstance(&inst);
#endif
window.resize(1280, 720);
window.setTitle(QCoreApplication::applicationName() + QLatin1String(" - ") + window.graphicsApiName());
window.show();
int ret = app.exec();
// RhiWindow::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 (window.handle())
window.releaseSwapChain();
return ret;
}
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