Add macOS Support (#537)

src/main/support.cpp

@@ -0,0 +1,58 @@
+#include "zelda_support.h"
+#include <SDL.h>
+#include "nfd.h"
+#include "RmlUi/Core.h"
+
+namespace zelda64 {
+    // MARK: - Internal Helpers
+    void perform_file_dialog_operation(const std::function<void(bool, const std::filesystem::path&)>& callback) {
+        nfdnchar_t* native_path = nullptr;
+        nfdresult_t result = NFD_OpenDialogN(&native_path, nullptr, 0, nullptr);
+
+        bool success = (result == NFD_OKAY);
+        std::filesystem::path path;
+
+        if (success) {
+            path = std::filesystem::path{native_path};
+            NFD_FreePathN(native_path);
+        }
+
+        callback(success, path);
+    }
+
+    // MARK: - Public API
+
+    std::filesystem::path get_asset_path(const char* asset) {
+        std::filesystem::path base_path = "";
+#if defined(__APPLE__)
+        const char* resource_dir = get_bundle_resource_directory();
+        base_path = resource_dir;
+        free((void*)resource_dir);
+#endif
+
+        return base_path / "assets" / asset;
+    }
+
+    void open_file_dialog(std::function<void(bool success, const std::filesystem::path& path)> callback) {
+#ifdef __APPLE__
+        dispatch_on_ui_thread([callback]() {
+            perform_file_dialog_operation(callback);
+        });
+#else
+        perform_file_dialog_operation(callback);
+#endif
+    }
+
+    void show_error_message_box(const char *title, const char *message) {
+#ifdef __APPLE__
+    std::string title_copy(title);
+    std::string message_copy(message);
+
+    dispatch_on_ui_thread([title_copy, message_copy] {
+        SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, title_copy.c_str(), message_copy.c_str(), nullptr);
+    });
+#else
+        SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, title, message, nullptr);
+#endif
+    }
+}