yuzu qt: Handle per-game configs for title id 0

Currently with programs that have a 0 title id, yuzu loads the custom
configuration 0000000000000000.ini for per-game configs. This is not
ideal since many homebrews share this id. Instead for these programs, we
load a config that is simply the file name and `.ini` appended to it.

src/yuzu/configuration/config.cpp

@@ -16,7 +16,7 @@
 
 namespace FS = Common::FS;
 
-Config::Config(const std::string& config_name, ConfigType config_type) : type(config_type) {
+Config::Config(std::string_view config_name, ConfigType config_type) : type(config_type) {
     global = config_type == ConfigType::GlobalConfig;
 
     Initialize(config_name);
@@ -242,7 +242,7 @@ const std::array<UISettings::Shortcut, 17> Config::default_hotkeys{{
 }};
 // clang-format on
 
-void Config::Initialize(const std::string& config_name) {
+void Config::Initialize(std::string_view config_name) {
     const auto fs_config_loc = FS::GetYuzuPath(FS::YuzuPath::ConfigDir);
     const auto config_file = fmt::format("{}.ini", config_name);
 

src/yuzu/configuration/config.h

@@ -22,7 +22,7 @@ public:
         InputProfile,
     };
 
-    explicit Config(const std::string& config_name = "qt-config",
+    explicit Config(std::string_view config_name = "qt-config",
                     ConfigType config_type = ConfigType::GlobalConfig);
     ~Config();
 
@@ -45,7 +45,7 @@ public:
     static const std::array<UISettings::Shortcut, 17> default_hotkeys;
 
 private:
-    void Initialize(const std::string& config_name);
+    void Initialize(std::string_view config_name);
 
     void ReadValues();
     void ReadPlayerValue(std::size_t player_index);

src/yuzu/configuration/configure_per_game.cpp

@@ -4,6 +4,7 @@
 
 #include <algorithm>
 #include <memory>
+#include <string>
 #include <utility>
 
 #include <QCheckBox>
@@ -14,6 +15,7 @@
 #include <QTimer>
 #include <QTreeView>
 
+#include "common/fs/path_util.h"
 #include "core/core.h"
 #include "core/file_sys/control_metadata.h"
 #include "core/file_sys/patch_manager.h"
@@ -26,10 +28,15 @@
 #include "yuzu/uisettings.h"
 #include "yuzu/util/util.h"
 
-ConfigurePerGame::ConfigurePerGame(QWidget* parent, u64 title_id)
+ConfigurePerGame::ConfigurePerGame(QWidget* parent, u64 title_id, std::string_view file_name)
     : QDialog(parent), ui(std::make_unique<Ui::ConfigurePerGame>()), title_id(title_id) {
-    game_config = std::make_unique<Config>(fmt::format("{:016X}", title_id),
-                                           Config::ConfigType::PerGameConfig);
+    if (title_id == 0) {
+        game_config = std::make_unique<Config>(Common::FS::GetFilename(file_name),
+                                               Config::ConfigType::PerGameConfig);
+    } else {
+        game_config = std::make_unique<Config>(fmt::format("{:016X}", title_id),
+                                               Config::ConfigType::PerGameConfig);
+    }
 
     Settings::SetConfiguringGlobal(false);
 

src/yuzu/configuration/configure_per_game.h

@@ -5,6 +5,7 @@
 #pragma once
 
 #include <memory>
+#include <string>
 #include <vector>
 
 #include <QDialog>
@@ -27,7 +28,7 @@ class ConfigurePerGame : public QDialog {
     Q_OBJECT
 
 public:
-    explicit ConfigurePerGame(QWidget* parent, u64 title_id);
+    explicit ConfigurePerGame(QWidget* parent, u64 title_id, std::string_view file_name);
     ~ConfigurePerGame() override;
 
     /// Save all button configurations to settings file