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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
#include <QApplication>
#include "startup_checks.h"
#if YUZU_ROOM
#include <cstring>
#include "dedicated_room/yuzu_room.h"
#endif
#ifdef __unix__
#include "qt_common/gui_settings.h"
#endif
#ifndef _WIN32
#include <sys/resource.h>
#endif
#if defined(__APPLE__)
#include <climits>
#include <cstdlib>
#include <cstring>
#endif
#include "main_window.h"
#ifdef _WIN32
#include <QScreen>
static void OverrideWindowsFont() {
// Qt5 chooses these fonts on Windows and they have fairly ugly alphanumeric/cyrillic characters
// Asking to use "MS Shell Dlg 2" gives better other chars while leaving the Chinese Characters.
const QString startup_font = QApplication::font().family();
const QStringList ugly_fonts = {QStringLiteral("SimSun"), QStringLiteral("PMingLiU")};
if (ugly_fonts.contains(startup_font)) {
QApplication::setFont(QFont(QStringLiteral("MS Shell Dlg 2"), 9, QFont::Normal));
}
}
#endif
static Qt::HighDpiScaleFactorRoundingPolicy GetHighDpiRoundingPolicy() {
#ifdef _WIN32
// For Windows, we want to avoid scaling artifacts on fractional scaling ratios.
// This is done by setting the optimal scaling policy for the primary screen.
// Create a temporary QApplication.
int temp_argc = 0;
char** temp_argv = nullptr;
QApplication temp{temp_argc, temp_argv};
// Get the current screen geometry.
const QScreen* primary_screen = QGuiApplication::primaryScreen();
if (primary_screen == nullptr) {
return Qt::HighDpiScaleFactorRoundingPolicy::PassThrough;
}
const QRect screen_rect = primary_screen->geometry();
const qreal real_ratio = primary_screen->devicePixelRatio();
const qreal real_width = std::trunc(screen_rect.width() * real_ratio);
const qreal real_height = std::trunc(screen_rect.height() * real_ratio);
// Recommended minimum width and height for proper window fit.
// Any screen with a lower resolution than this will still have a scale of 1.
constexpr qreal minimum_width = 1350.0;
constexpr qreal minimum_height = 900.0;
const qreal width_ratio = std::max(1.0, real_width / minimum_width);
const qreal height_ratio = std::max(1.0, real_height / minimum_height);
// Get the lower of the 2 ratios and truncate, this is the maximum integer scale.
const qreal max_ratio = std::trunc(std::min(width_ratio, height_ratio));
return max_ratio > real_ratio ? Qt::HighDpiScaleFactorRoundingPolicy::Round
: Qt::HighDpiScaleFactorRoundingPolicy::Floor;
#else
// Other OSes should be better than Windows at fractional scaling.
return Qt::HighDpiScaleFactorRoundingPolicy::PassThrough;
#endif
}
int main(int argc, char* argv[]) {
#if YUZU_ROOM
bool launch_room = false;
for (int i = 1; i < argc; i++) {
if (strcmp(argv[i], "--room") == 0) {
launch_room = true;
}
}
if (launch_room) {
LaunchRoom(argc, argv, true);
return 0;
}
#endif
bool has_broken_vulkan = false;
bool is_child = false;
if (CheckEnvVars(&is_child)) {
return 0;
}
if (StartupChecks(argv[0], &has_broken_vulkan,
Settings::values.perform_vulkan_check.GetValue())) {
return 0;
}
#ifdef YUZU_CRASH_DUMPS
Breakpad::InstallCrashHandler();
#endif
// Init settings params
QCoreApplication::setOrganizationName(QStringLiteral("eden"));
QCoreApplication::setApplicationName(QStringLiteral("Eglantine"));
// Increases the maximum open file limit.
// TODO: This should be common to all frontends.
#ifdef _WIN32
// MSVCRT limits this to 2048 for some inexplicable (and likely arcane) reason,
// so we have to account for that as well.
#ifdef __MSVCRT__
_setmaxstdio(2048);
#else
_setmaxstdio(8192);
#endif // __MSVCRT__
#elif defined(__unix__) || defined(__APPLE__)
// Raise the open file limit to at least 8192, or the hard limit.
// Most sane systems should not hit the hard limit here.
struct rlimit rl;
if (getrlimit(RLIMIT_NOFILE, &rl) == 0) {
rl.rlim_cur = std::min<rlim_t>(1048576, rl.rlim_max);
setrlimit(RLIMIT_NOFILE, &rl);
}
#endif // _WIN32
#if defined(__APPLE__)
// Convert the relative path to an absolute path before the chdir
char resolved[PATH_MAX];
for (int i = 1; i < argc; ++i) {
if (strcmp(argv[i], "-u") == 0 || strcmp(argv[i], "-input-profile") == 0) {
++i;
} else if (argv[i][0] != '-' && argv[i][0] != '/' && realpath(argv[i], resolved)) {
argv[i] = strdup(resolved);
}
}
// If you start a bundle (binary) on OSX without the Terminal, the working directory is "/".
// But since we require the working directory to be the executable path for the location of
// the user folder in the Qt Frontend, we need to cd into that working directory
const auto bin_path = Common::FS::GetBundleDirectory() / "..";
chdir(Common::FS::PathToUTF8String(bin_path).c_str());
#endif
#ifdef __unix__
// Set the DISPLAY variable in order to open web browsers
// TODO (lat9nq): Find a better solution for AppImages to start external applications
if (QString::fromLocal8Bit(qgetenv("DISPLAY")).isEmpty()) {
qputenv("DISPLAY", ":0");
}
if (GraphicsBackend::GetForceX11() && qEnvironmentVariableIsEmpty("QT_QPA_PLATFORM"))
qputenv("QT_QPA_PLATFORM", "xcb");
// Fix the Wayland appId. This needs to match the name of the .desktop file without the .desktop
// suffix.
QGuiApplication::setDesktopFileName(QStringLiteral("dev.eglantine.eglantine"));
#endif
auto rounding_policy = GetHighDpiRoundingPolicy();
QApplication::setHighDpiScaleFactorRoundingPolicy(rounding_policy);
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
// Disables the "?" button on all dialogs. Disabled by default on Qt6.
QCoreApplication::setAttribute(Qt::AA_DisableWindowContextHelpButton);
#endif
// Enables the core to make the qt created contexts current on std::threads
QCoreApplication::setAttribute(Qt::AA_DontCheckOpenGLContextThreadAffinity);
#ifdef _WIN32
QApplication::setStyle(QStringLiteral("windowsvista"));
#endif
QApplication app(argc, argv);
#ifdef _WIN32
OverrideWindowsFont();
#endif
// Workaround for QTBUG-85409, for Suzhou numerals the number 1 is actually \u3021
// so we can see if we get \u3008 instead
// TL;DR all other number formats are consecutive in unicode code points
// This bug is fixed in Qt6, specifically 6.0.0-alpha1
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
const QLocale locale = QLocale::system();
if (QStringLiteral("\u3008") == locale.toString(1)) {
QLocale::setDefault(QLocale::system().name());
}
#endif
// Qt changes the locale and causes issues in float conversion using std::to_string() when
// generating shaders
setlocale(LC_ALL, "C");
MainWindow main_window{has_broken_vulkan};
// After settings have been loaded by GMainWindow, apply the filter
main_window.show();
app.connect(&app, &QGuiApplication::applicationStateChanged, &main_window, &MainWindow::OnAppFocusStateChanged);
return app.exec();
}
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