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// SPDX-License-Identifier: GPL-3.0-only
// SPDX-FileCopyrightText: 2026 Project Tick
// SPDX-FileContributor: Project Tick Team
/*
* ProjT Launcher - Minecraft Launcher
* Copyright (C) 2026 Project Tick
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* === Upstream License Block (Do Not Modify) ==============================
*
* PrismLauncher - Minecraft Launcher
* Copyright (C) 2022 Jan Drögehoff <sentrycraft123@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
======================================================================== */
#include <QDebug>
#include <QDir>
#include <QString>
#include <QStringList>
#include <QSysInfo>
#include <QtGlobal>
#include "FileSystem.h"
#include "Json.h"
#include "MangoHud.h"
#ifdef __GLIBC__
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#define UNDEF_GNU_SOURCE
#endif
#include <dlfcn.h>
#include <linux/limits.h>
#endif
namespace MangoHud
{
QString getLibraryString()
{
/**
* Guess MangoHud install location by searching for vulkan layers in this order:
*
* $VK_LAYER_PATH
* $XDG_DATA_DIRS (/usr/local/share/:/usr/share/)
* $XDG_DATA_HOME (~/.local/share)
* /etc
* $XDG_CONFIG_DIRS (/etc/xdg)
* $XDG_CONFIG_HOME (~/.config)
*
* @returns Absolute path of libMangoHud.so if found and empty QString otherwise.
*/
QStringList vkLayerList;
{
QString home = QDir::homePath();
QString vkLayerPath = qEnvironmentVariable("VK_LAYER_PATH");
if (!vkLayerPath.isEmpty())
{
vkLayerList << vkLayerPath;
}
QStringList xdgDataDirs =
qEnvironmentVariable("XDG_DATA_DIRS", "/usr/local/share/:/usr/share/").split(QLatin1String(":"));
for (QString dir : xdgDataDirs)
{
vkLayerList << FS::PathCombine(dir, "vulkan", "implicit_layer.d");
}
QString xdgDataHome = qEnvironmentVariable("XDG_DATA_HOME");
if (xdgDataHome.isEmpty())
{
xdgDataHome = FS::PathCombine(home, ".local", "share");
}
vkLayerList << FS::PathCombine(xdgDataHome, "vulkan", "implicit_layer.d");
vkLayerList << "/etc";
QStringList xdgConfigDirs = qEnvironmentVariable("XDG_CONFIG_DIRS", "/etc/xdg").split(QLatin1String(":"));
for (QString dir : xdgConfigDirs)
{
vkLayerList << FS::PathCombine(dir, "vulkan", "implicit_layer.d");
}
QString xdgConfigHome = qEnvironmentVariable("XDG_CONFIG_HOME");
if (xdgConfigHome.isEmpty())
{
xdgConfigHome = FS::PathCombine(home, ".config");
}
vkLayerList << FS::PathCombine(xdgConfigHome, "vulkan", "implicit_layer.d");
}
for (const QString& vkLayer : vkLayerList)
{
// prefer to use architecture specific vulkan layers
QString currentArch = QSysInfo::currentCpuArchitecture();
if (currentArch == "arm64")
{
currentArch = "aarch64";
}
QStringList manifestNames = { QString("MangoHud.%1.json").arg(currentArch), "MangoHud.json" };
QString filePath{};
for (const QString& manifestName : manifestNames)
{
QString tryPath = FS::PathCombine(vkLayer, manifestName);
if (QFile::exists(tryPath))
{
filePath = tryPath;
break;
}
}
if (filePath.isEmpty())
{
continue;
}
try
{
auto conf = Json::requireDocument(filePath, vkLayer);
auto confObject = Json::requireObject(conf, vkLayer);
auto layer = Json::ensureObject(confObject, "layer");
QString libraryName = Json::ensureString(layer, "library_path");
if (libraryName.isEmpty())
{
continue;
}
if (QFileInfo(libraryName).isAbsolute())
{
return libraryName;
}
#ifdef __GLIBC__
// Check whether mangohud is usable on a glibc based system
QString libraryPath = findLibrary(libraryName);
if (!libraryPath.isEmpty())
{
return libraryPath;
}
#else
// Without glibc return recorded shared library as-is.
return libraryName;
#endif
}
catch (const Exception& e)
{}
}
return {};
}
QString findLibrary(QString libName)
{
#ifdef __GLIBC__
const char* library = libName.toLocal8Bit().constData();
void* handle = dlopen(library, RTLD_NOW);
if (!handle)
{
qCritical() << "dlopen() failed:" << dlerror();
return {};
}
char path[PATH_MAX];
if (dlinfo(handle, RTLD_DI_ORIGIN, path) == -1)
{
qCritical() << "dlinfo() failed:" << dlerror();
dlclose(handle);
return {};
}
auto fullPath = FS::PathCombine(QString(path), libName);
dlclose(handle);
return fullPath;
#else
qWarning() << "MangoHud::findLibrary is not implemented on this platform";
return {};
#endif
}
} // namespace MangoHud
#ifdef UNDEF_GNU_SOURCE
#undef _GNU_SOURCE
#undef UNDEF_GNU_SOURCE
#endif
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