keys for rewind/unwind from within emulator added (start pause mode and work in pause mode too)

entering debugger from pause mode allowed (TODO: allow more functions)
"Pause" displays always immediately

src/common/StateManager.cxx

@@ -134,6 +134,22 @@ void StateManager::toggleRewindMode()
     myOSystem.frameBuffer().showMessage("Continuous rewind disabled");
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+bool StateManager::rewindState()
+{
+  RewindManager& r = myOSystem.state().rewindManager();
+  // TODO: add parameter to indicate rewinding from within emulation
+  return r.rewindState();
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+bool StateManager::unwindState()
+{
+  RewindManager& r = myOSystem.state().rewindManager();
+  // TODO: add parameter to indicate unwinding from within emulation
+  return r.unwindState();
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void StateManager::update()
 {

src/common/StateManager.hxx

@@ -64,6 +64,16 @@ class StateManager
     */
     void toggleRewindMode();
 
+    /**
+      Rewinds one state; this uses the RewindManager for its functionality.
+    */
+    bool rewindState();
+
+    /**
+      Unwinds one state; this uses the RewindManager for its functionality.
+    */
+    bool unwindState();
+
     /**
       Updates the state of the system based on the currently active mode.
     */

src/emucore/EventHandler.cxx

@@ -273,9 +273,30 @@ void EventHandler::handleKeyEvent(StellaKey key, StellaMod mod, bool state)
     {
       myOSystem.frameBuffer().toggleFullscreen();
     }
-    // These only work when in emulation mode
+    // state rewinding must work in pause mode too
-    else if(myState == S_EMULATE)
+    else if(myState == S_EMULATE || myState == S_PAUSE)
     {
+      switch(key)
+      {
+        case KBDK_LEFT:  // Alt-left rewinds states
+          if(myOSystem.state().rewindState() && myState != S_PAUSE)
+            setEventState(S_PAUSE);
+          break;
+
+        case KBDK_RIGHT:  // Alt-right unwinds states
+          if(myOSystem.state().unwindState() && myState != S_PAUSE)
+            setEventState(S_PAUSE);
+          break;
+
+        default:
+          handled = false;
+          break;
+      }
+    }
+    // These only work when in emulation mode
+    if(!handled && myState == S_EMULATE)
+    {
+      handled = true;
       switch(key)
       {
         case KBDK_EQUALS:
@@ -566,10 +587,19 @@ void EventHandler::handleKeyEvent(StellaKey key, StellaMod mod, bool state)
     case S_EMULATE:
       handleEvent(myKeyTable[key][kEmulationMode], state);
       break;
+
     case S_PAUSE:
-      if(myKeyTable[key][kEmulationMode] == Event::TakeSnapshot)
+      switch(myKeyTable[key][kEmulationMode])
-        handleEvent(myKeyTable[key][kEmulationMode], state);
+      {
+        case Event::TakeSnapshot:
+        case Event::DebuggerMode:
+          handleEvent(myKeyTable[key][kEmulationMode], state);
+
+        default:
+          break;
+      }
       break;
+
     default:
       if(myOverlay)
         myOverlay->handleKeyEvent(key, mod, state);
@@ -1174,7 +1204,7 @@ bool EventHandler::eventStateChange(Event::Type type)
       break;
 
     case Event::DebuggerMode:
-      if(myState == S_EMULATE)
+      if(myState == S_EMULATE || myState == S_PAUSE)
         enterDebugMode();
       else if(myState == S_DEBUGGER)
         leaveDebugMode();

src/emucore/FrameBuffer.cxx

@@ -285,6 +285,7 @@ void FrameBuffer::update()
         myStatsMsg.surface->setDstPos(myImageRect.x() + 1, myImageRect.y() + 1);
         myStatsMsg.surface->render();
       }
+      myPausedCount = 0;
       break;  // S_EMULATE
     }
 
@@ -292,10 +293,10 @@ void FrameBuffer::update()
     {
       myTIASurface->render();
 
-      // Show a pause message every 5 seconds
+      // Show a pause message immediately and then every 7 seconds
-      if(myPausedCount++ >= 7*myOSystem.frameRate())
+      if (myPausedCount-- <= 0)
       {
-        myPausedCount = 0;
+        myPausedCount = uInt32(7 * myOSystem.frameRate());
         showMessage("Paused", kMiddleCenter);
       }
       break;  // S_PAUSE

src/emucore/FrameBuffer.hxx

@@ -475,7 +475,7 @@ class FrameBuffer
     uInt32 myInitializedCount;
 
     // Used to set intervals between messages while in pause mode
-    uInt32 myPausedCount;
+    Int32 myPausedCount;
 
     // Dimensions of the actual image, after zooming, and taking into account
     // any image 'centering'