From 1107dff9fa64f9ecf830709e3910b24e3640386c Mon Sep 17 00:00:00 2001
From: wheremyfoodat <44909372+wheremyfoodat@users.noreply.github.com>
Date: Wed, 26 Jul 2023 19:29:34 +0300
Subject: [PATCH] Implement pause/resume

---
 include/emulator.hpp |  6 +++++-
 src/emulator.cpp     | 15 ++++++++++++---
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/include/emulator.hpp b/include/emulator.hpp
index d738aef3..b6662331 100644
--- a/include/emulator.hpp
+++ b/include/emulator.hpp
@@ -59,7 +59,8 @@ class Emulator {
 	static constexpr u32 width = 400;
 	static constexpr u32 height = 240 * 2;  // * 2 because 2 screens
 	ROMType romType = ROMType::None;
-	bool running = true;
+	bool running = false;         // Is the emulator running a game?
+	bool programRunning = false;  // Is the emulator program itself running?
 
 #ifdef PANDA3DS_ENABLE_HTTP_SERVER
 	HttpServer httpServer;
@@ -89,6 +90,9 @@ class Emulator {
 	void run();
 	void runFrame();
 
+	void resume();  // Resume the emulator
+	void pause();   // Pause the emulator
+
 	bool loadROM(const std::filesystem::path& path);
 	bool loadNCSD(const std::filesystem::path& path, ROMType type);
 	bool loadELF(const std::filesystem::path& path);
diff --git a/src/emulator.cpp b/src/emulator.cpp
index bcca5ffa..e04f073d 100644
--- a/src/emulator.cpp
+++ b/src/emulator.cpp
@@ -75,6 +75,8 @@ Emulator::Emulator()
 		}
 	}
 
+	running = false;
+	programRunning = false;
 	reset(ReloadOption::NoReload);
 }
 
@@ -114,7 +116,9 @@ void Emulator::step() {}
 void Emulator::render() {}
 
 void Emulator::run() {
-	while (running) {
+	programRunning = true;
+
+	while (programRunning) {
 		runFrame();
 		HIDService& hid = kernel.getServiceManager().getHID();
 
@@ -125,7 +129,7 @@ void Emulator::run() {
 			switch (event.type) {
 				case SDL_QUIT:
 					printf("Bye :(\n");
-					running = false;
+					programRunning = false;
 					return;
 
 				case SDL_KEYDOWN:
@@ -344,8 +348,12 @@ void Emulator::run() {
 	}
 }
 
+// Only resume if a ROM is properly loaded
+void Emulator::resume() { running = (romType != ROMType::None); }
+void Emulator::pause() { running = false; }
+
 void Emulator::runFrame() {
-	if (romType != ROMType::None) {
+	if (running) {
 #ifdef PANDA3DS_ENABLE_HTTP_SERVER
 		httpServer.processActions();
 #endif
@@ -408,6 +416,7 @@ bool Emulator::loadROM(const std::filesystem::path& path) {
 		romType = ROMType::None;
 	}
 
+	resume();  // Start the emulator
 	return success;
 }