[qt] refactor: qt_common lib (#94)

This is part of a series of PRs made in preparation for the QML rewrite. this PR specifically moves a bunch of utility functions from main.cpp into qt_common, with the biggest benefit being that QML can reuse the exact same code through ctx passthrough.

Also, QtCommon::Frontend is an abstraction layer over several previously Widgets-specific stuff like QMessageBox that gets used everywhere. The idea is that once QML is implemented, these functions can have a Quick version implemented for systems that don't work well with Widgets (sun) or for those on Plasma 6+ (reduces memory usage w/o Widgets linkage) although Quick from C++ is actually anal, but whatever.

Other than that this should also just kinda reduce the size of main.cpp which is a 6000-line behemoth rn, and clangd straight up gives up with it for me (likely caused by the massive amount of headers, which this DOES reduce).

In the future, I probably want to create a common strings lookup table that both Qt and QML can reference--though I'm not sure how much linguist likes that--which should give us a way to keep language consistent (use frozen-map).

TODO: Docs for Qt stuff

Co-authored-by: MaranBr <maranbr@outlook.com>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/94
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: Shinmegumi <shinmegumi@eden-emu.dev>

1 files changed, 28 insertions, 0 deletions

diff --git a/src/qt_common/qt_path_util.cpp b/src/qt_common/qt_path_util.cpp
new file mode 100644
index 0000000000..761e6e8405
--- /dev/null
+++ b/src/qt_common/qt_path_util.cpp
@@ -0,0 +1,28 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "qt_path_util.h"
+#include <QDesktopServices>
+#include <QString>
+#include <QUrl>
+#include "common/fs/fs.h"
+#include "common/fs/path_util.h"
+#include "qt_common/qt_frontend_util.h"
+#include <fmt/format.h>
+
+namespace QtCommon::Path {
+
+bool OpenShaderCache(u64 program_id, QObject *parent)
+{
+    const auto shader_cache_dir = Common::FS::GetEdenPath(Common::FS::EdenPath::ShaderDir);
+    const auto shader_cache_folder_path{shader_cache_dir / fmt::format("{:016x}", program_id)};
+    if (!Common::FS::CreateDirs(shader_cache_folder_path)) {
+        QtCommon::Frontend::ShowMessage(QMessageBox::Warning, "Error Opening Shader Cache", "Failed to create or open shader cache for this title, ensure your app data directory has write permissions.", QMessageBox::Ok, parent);
+    }
+
+    const auto shader_path_string{Common::FS::PathToUTF8String(shader_cache_folder_path)};
+    const auto qt_shader_cache_path = QString::fromStdString(shader_path_string);
+    return QDesktopServices::openUrl(QUrl::fromLocalFile(qt_shader_cache_path));
+}
+
+}