Decouple emulator and frontend code

include/emulator.hpp

@@ -1,7 +1,5 @@
 #pragma once
 
-#include <SDL.h>
-
 #include <filesystem>
 #include <fstream>
 #include <optional>
@@ -25,6 +23,8 @@
 #include "gl/context.h"
 #endif
 
+class SDL_Window;
+
 enum class ROMType {
 	None,
 	ELF,
@@ -42,17 +42,6 @@ class Emulator {
 	Crypto::AESEngine aesEngine;
 	Cheats cheats;
 
-#ifdef PANDA3DS_FRONTEND_SDL
-	SDL_Window* window;
-
-#ifdef PANDA3DS_ENABLE_OPENGL
-	SDL_GLContext glContext;
-#endif
-#endif
-
-	SDL_GameController* gameController = nullptr;
-	int gameControllerID;
-
 	// Variables to keep track of whether the user is controlling the 3DS analog stick with their keyboard
 	// This is done so when a gamepad is connected, we won't automatically override the 3DS analog stick settings with the gamepad's state
 	// And so the user can still use the keyboard to control the analog
@@ -100,7 +89,7 @@ class Emulator {
 	void step();
 	void render();
 	void reset(ReloadOption reload);
-	void run();
+	void run(void* frontend = nullptr);
 	void runFrame();
 
 	void resume();  // Resume the emulator
@@ -118,7 +107,7 @@ class Emulator {
 	// For passing the GL context from Qt to the renderer
 	void initGraphicsContext(GL::Context* glContext) { gpu.initGraphicsContext(nullptr); }
 #else
-	void initGraphicsContext() { gpu.initGraphicsContext(window); }
+	void initGraphicsContext(SDL_Window* window) { gpu.initGraphicsContext(window); }
 #endif
 
 	RomFS::DumpingResult dumpRomFS(const std::filesystem::path& path);

include/panda_qt/main_window.hpp

@@ -1,5 +1,7 @@
 #pragma once
 
+#include <SDL.h>
+
 #include <QApplication>
 #include <QComboBox>
 #include <QMenuBar>
@@ -37,6 +39,9 @@ class MainWindow : public QMainWindow {
 	QComboBox* themeSelect = nullptr;
 	QMenuBar* menuBar = nullptr;
 
+	SDL_GameController* gameController = nullptr;
+	int gameControllerID;
+
 	Theme currentTheme;
 	void setTheme(Theme theme);
 	void swapEmuBuffer();

include/panda_sdl/frontend_sdl.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <SDL.h>
+
+#include "emulator.hpp"
+
+struct FrontendSDL {
+	FrontendSDL();
+	bool loadROM(const std::filesystem::path& path);
+	void run();
+
+	Emulator emu;
+	SDL_Window* window = nullptr;
+#ifdef PANDA3DS_ENABLE_OPENGL
+	SDL_GLContext glContext;
+#endif
+	SDL_GameController* gameController = nullptr;
+	int gameControllerID;
+};