4 files changed, 26 insertions, 6 deletions
diff --git a/engines/cine/cine.cpp b/engines/cine/cine.cpp
index 9594b42e51..2caf69da6c 100644
--- a/engines/cine/cine.cpp
+++ b/engines/cine/cine.cpp
@@ -105,8 +105,22 @@ int CineEngine::go() {
 	return 0;
 }
 
+int CineEngine::getTimerDelay() const {
+	return (10923000 * _timerDelayMultiplier) / 1193180;
+}
+
+/*! \brief Modify game speed
+ * \param speedChange Negative values slow game down, positive values speed it up, zero does nothing
+ * \return Timer delay multiplier's value after the game speed change
+ */
+int CineEngine::modifyGameSpeed(int speedChange) {
+	// If we want more speed we decrement the timer delay multiplier and vice versa.
+	_timerDelayMultiplier = CLIP(_timerDelayMultiplier - speedChange, 1, 50);
+	return _timerDelayMultiplier;
+}
 
 void CineEngine::initialize() {
+	_timerDelayMultiplier = 12; // Set default speed
 	setupOpcodes();
 
 	initLanguage(g_cine->getLanguage());
diff --git a/engines/cine/cine.h b/engines/cine/cine.h
index eaae555812..431cdc2c22 100644
--- a/engines/cine/cine.h
+++ b/engines/cine/cine.h
@@ -86,6 +86,8 @@ public:
 
 	bool loadSaveDirectory(void);
 	void makeSystemMenu(void);
+	int modifyGameSpeed(int speedChange);
+	int getTimerDelay() const;
 
 	const CINEGameDescription *_gameDescription;
 	Common::File _partFileHandle;
@@ -109,6 +111,7 @@ private:
 	void readVolCnf();
 
 	bool _preLoad;
+	int _timerDelayMultiplier;
 };
 
 extern CineEngine *g_cine;
diff --git a/engines/cine/main_loop.cpp b/engines/cine/main_loop.cpp
index 80a8905465..654dd6b78c 100644
--- a/engines/cine/main_loop.cpp
+++ b/engines/cine/main_loop.cpp
@@ -125,6 +125,14 @@ static void processEvent(Common::Event &event) {
 				g_cine->makeSystemMenu();
 			}
 			break;
+		case Common::KEYCODE_MINUS:
+		case Common::KEYCODE_KP_MINUS:
+			g_cine->modifyGameSpeed(-1); // Slower
+			break;
+		case Common::KEYCODE_PLUS:
+		case Common::KEYCODE_KP_PLUS:
+			g_cine->modifyGameSpeed(+1); // Faster
+			break;
 		default:
 			lastKeyStroke = event.kbd.keycode;
 			break;
@@ -138,7 +146,7 @@ static void processEvent(Common::Event &event) {
 void manageEvents() {
 	Common::EventManager *eventMan = g_system->getEventManager();
 
-	uint32 nextFrame = g_system->getMillis() + kGameTimerDelay * kGameSpeed;
+	uint32 nextFrame = g_system->getMillis() + g_cine->getTimerDelay();
 	do {
 		Common::Event event;
 		while (eventMan->pollEvent(event)) {
diff --git a/engines/cine/main_loop.h b/engines/cine/main_loop.h
index a2f828fd34..c729b324ca 100644
--- a/engines/cine/main_loop.h
+++ b/engines/cine/main_loop.h
@@ -28,11 +28,6 @@
 
 namespace Cine {
 
-enum {
-	kGameTimerDelay = 1000 / (1193180 / 10923),
-	kGameSpeed = 12
-};
-
 void mainLoop(int bootScriptIdx);
 void manageEvents();