CGE: Set up a separate variable for the game tick speed, independent from frame rate

3 files changed, 23 insertions, 6 deletions

diff --git a/engines/cge/cge.cpp b/engines/cge/cge.cpp
index bb5b786330..97712591fa 100644
--- a/engines/cge/cge.cpp
+++ b/engines/cge/cge.cpp
@@ -58,6 +58,7 @@ CGEEngine::CGEEngine(OSystem *syst, const ADGameDescription *gameDescription)
 void CGEEngine::setup() {
 	// Initialise fields
 	_lastFrame = 0;
+	_lastTick = 0;
 	_hero = NULL;
 	_shadow = NULL;
 	_miniCave = NULL;
diff --git a/engines/cge/cge.h b/engines/cge/cge.h
index 851a1166ab..5187e57c0f 100644
--- a/engines/cge/cge.h
+++ b/engines/cge/cge.h
@@ -74,7 +74,7 @@ extern const char *SAVEGAME_STR;
 
 class CGEEngine : public Engine {
 private:
-	uint32 _lastFrame;
+	uint32 _lastFrame, _lastTick;
 	void tick();
 	void syncHeader(Common::Serializer &s);
 	static void writeSavegameHeader(Common::OutSaveFile *out, SavegameHeader &header);
@@ -156,6 +156,7 @@ public:
 	void setIRQ();
 	void setDMA();
 	void mainLoop();
+	void handleFrame();
 	void saveGame(int slotNumber, const Common::String &desc);
 	static bool readSavegameHeader(Common::InSaveFile *in, SavegameHeader &header);
 	void switchMusic();
diff --git a/engines/cge/cge_main.cpp b/engines/cge/cge_main.cpp
index f3b2784ca6..ad31a5c1e6 100644
--- a/engines/cge/cge_main.cpp
+++ b/engines/cge/cge_main.cpp
@@ -1411,6 +1411,7 @@ void CGEEngine::loadScript(const char *fname) {
 }
 
 #define GAME_FRAME_DELAY (1000 / 50)
+#define GAME_TICK_DELAY (1000 / 62)
 
 void CGEEngine::mainLoop() {
 	sayDebug();
@@ -1432,23 +1433,37 @@ void CGEEngine::mainLoop() {
 	_snail_->runCom();
 	_snail->runCom();
 
+	// Handle a delay between game frames
+	handleFrame();
+
+	// Handle any pending events
+	_eventManager->poll();
+}
+
+void CGEEngine::handleFrame() {
 	// Game frame delay
 	uint32 millis = g_system->getMillis();
 	while (!_eventManager->_quitFlag && (millis < (_lastFrame + GAME_FRAME_DELAY))) {
 		// Handle any pending events
 		_eventManager->poll();
 
+		if (millis >= (_lastTick + GAME_TICK_DELAY)) {
+			// Dispatch the tick to any active objects
+			tick();
+			_lastTick = millis;
+		}
+
 		// Slight delay
 		g_system->delayMillis(10);
 		millis = g_system->getMillis();
 	}
 	_lastFrame = millis;
 
-	// Dispatch the tick to any active objects
-	tick();
-
-	// Handle any pending events
-	_eventManager->poll();
+	if (millis >= (_lastTick + GAME_TICK_DELAY)) {
+		// Dispatch the tick to any active objects
+		tick();
+		_lastTick = millis;
+	}
 }
 
 void CGEEngine::tick() {