added 'Turbo" mode

Changes.txt

@@ -22,7 +22,9 @@
     a game. This allows the user to save high scores for these games. For each
     game and variation, the top 10 scores can be saved. (TODO: Doc)
 
-  * Add option which lets default ROM path follow launcher navigation (TODO: Doc)
+  * Added 'Turbo' mode, runs the game as fast as the computer allows.
+
+  * Added option which lets default ROM path follow launcher navigation (TODO: Doc)
 
   * Added displaying last write address in the debugger.
 

docs/index.html

@@ -1626,6 +1626,12 @@
       <td>Control + i</td>
     </tr>
 
+    <tr>
+      <td>Toggle 'Turbo' mode</td>
+      <td>Control + t</td>
+      <td>Control + t</td>
+    </tr>
+
     <tr>
       <td>Toggle sound on/off</td>
       <td>Control + ]</td>
@@ -2004,6 +2010,11 @@
       <td>Control the emulation speed (as a percentage, 10 - 1000).</td>
     </tr>
 
+    <tr>
+      <td><pre>-turbo &lt;1|0&gt;</pre></td>
+      <td>Enable 'Turbo' mode for maximum emulation speed.</td>
+    </tr>
+
     <tr>
       <td><pre>-uimessages &lt;1|0&gt;</pre></td>
       <td>Enable or disable display of message in the UI. Note that messages

src/common/FrameBufferSDL2.cxx

@@ -320,7 +320,8 @@ bool FrameBufferSDL2::setVideoMode(const string& title, const VideoMode& mode)
   }
 
   uInt32 renderFlags = SDL_RENDERER_ACCELERATED;
-  if(myOSystem.settings().getBool("vsync"))  // V'synced blits option
+  if(myOSystem.settings().getBool("vsync")
+     && !myOSystem.settings().getBool("turbo"))  // V'synced blits option
     renderFlags |= SDL_RENDERER_PRESENTVSYNC;
   const string& video = myOSystem.settings().getString("video");  // Render hint
   if(video != "")

src/common/PKeyboardHandler.cxx

@@ -468,6 +468,7 @@ PhysicalKeyboardHandler::EventMappingArray PhysicalKeyboardHandler::DefaultCommo
   {Event::ToggleColorLoss,          KBDK_L, KBDM_CTRL},
   {Event::TogglePalette,            KBDK_P, KBDM_CTRL},
   {Event::ToggleInter,              KBDK_I, KBDM_CTRL},
+  {Event::ToggleTurbo,              KBDK_T, KBDM_CTRL},
   {Event::ToggleJitter,             KBDK_J, MOD3},
   {Event::ToggleFrameStats,         KBDK_L, MOD3},
   {Event::ToggleTimeMachine,        KBDK_T, MOD3},

src/emucore/Console.cxx

@@ -563,6 +563,24 @@ void Console::toggleInter()
   myOSystem.frameBuffer().showMessage(ss.str());
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void Console::toggleTurbo()
+{
+  bool enabled = myOSystem.settings().getBool("turbo");
+
+  myOSystem.settings().setValue("turbo", !enabled);
+
+  // update speed
+  initializeAudio();
+
+  // update VSync
+  myOSystem.createFrameBuffer();
+
+  ostringstream ss;
+  ss << "Turbo mode " << (!enabled ? "enabled" : "disabled");
+  myOSystem.frameBuffer().showMessage(ss.str());
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void Console::togglePhosphor()
 {
@@ -657,7 +675,9 @@ void Console::initializeAudio()
     .updatePlaybackPeriod(myAudioSettings.fragmentSize())
     .updateAudioQueueExtraFragments(myAudioSettings.bufferSize())
     .updateAudioQueueHeadroom(myAudioSettings.headroom())
-    .updateSpeedFactor(myOSystem.settings().getFloat("speed"));
+    .updateSpeedFactor(myOSystem.settings().getBool("turbo")
+      ? 20.0F
+      : myOSystem.settings().getFloat("speed"));
 
   createAudioQueue();
   myTIA->setAudioQueue(myAudioQueue);

src/emucore/Console.hxx

@@ -221,6 +221,11 @@ class Console : public Serializable, public ConsoleIO
     */
     void toggleInter();
 
+    /**
+      Toggle turbo mode on/off
+    */
+    void toggleTurbo();
+
 
     /**
       Toggles phosphor effect.

src/emucore/Event.hxx

@@ -120,6 +120,7 @@ class Event
       ToggleFrameStats, ToggleSAPortOrder, ExitGame,
 
       // add new events from here to avoid that user remapped events get overwritten
+      ToggleTurbo,
 
       LastType
     };

src/emucore/EventHandler.cxx

@@ -539,6 +539,10 @@ void EventHandler::handleEvent(Event::Type event, Int32 value, bool repeated)
       if (pressed && !repeated) myOSystem.console().toggleInter();
       return;
 
+    case Event::ToggleTurbo:
+      if (pressed && !repeated) myOSystem.console().toggleTurbo();
+      return;
+
     case Event::ToggleJitter:
       if (pressed && !repeated) myOSystem.console().toggleJitter();
       return;
@@ -1815,6 +1819,7 @@ EventHandler::EmulActionList EventHandler::ourEmulActionList = { {
   { Event::TogglePauseMode,         "Toggle Pause mode",                     "" },
   { Event::StartPauseMode,          "Start Pause mode",                      "" },
   { Event::Fry,                     "Fry cartridge",                         "" },
+  { Event::ToggleTurbo,             "Toggle Turbo mode",                     "" },
   { Event::DebuggerMode,            "Toggle Debugger mode",                  "" },
 
   { Event::ConsoleSelect,           "Select",                                "" },
@@ -2023,6 +2028,7 @@ EventHandler::MenuActionList EventHandler::ourMenuActionList = { {
 const Event::EventSet EventHandler::MiscEvents = {
   Event::Quit, Event::ReloadConsole, Event::Fry, Event::StartPauseMode,
   Event::TogglePauseMode, Event::OptionsMenuMode, Event::CmdMenuMode, Event::ExitMode,
+  Event::ToggleTurbo,
   Event::TakeSnapshot, Event::ToggleContSnapshots, Event::ToggleContSnapshotsFrame,
   // Event::MouseAxisXMove, Event::MouseAxisYMove,
   // Event::MouseButtonLeftValue, Event::MouseButtonRightValue,

src/emucore/EventHandler.hxx

@@ -468,7 +468,7 @@ class EventHandler
     #else
       PNG_SIZE             = 0,
     #endif
-      EMUL_ACTIONLIST_SIZE = 144 + PNG_SIZE + COMBO_SIZE,
+      EMUL_ACTIONLIST_SIZE = 145 + PNG_SIZE + COMBO_SIZE,
       MENU_ACTIONLIST_SIZE = 18
     ;
 

src/emucore/FrameBuffer.cxx

@@ -502,7 +502,10 @@ void FrameBuffer::drawFrameStats(float framesPerSecond)
   ss
     << std::fixed << std::setprecision(1) << framesPerSecond
     << "fps @ "
-    << std::fixed << std::setprecision(0) << 100 * myOSystem.settings().getFloat("speed")
+    << std::fixed << std::setprecision(0) << 100 *
+      (myOSystem.settings().getBool("turbo")
+        ? 20.0F
+        : myOSystem.settings().getFloat("speed"))
     << "% speed";
 
   myStatsMsg.surface->drawString(f, ss.str(), xPos, yPos,

src/emucore/Settings.cxx

@@ -157,6 +157,7 @@ Settings::Settings()
   setPermanent("threads", "false");
   setTemporary("romloadcount", "0");
   setTemporary("maxres", "");
+  setTemporary("turbo", "0");
 
 #ifdef DEBUGGER_SUPPORT
   // Debugger/disassembly options
@@ -400,6 +401,7 @@ void Settings::usage() const
     << "                 z26|\n"
     << "                 user>\n"
     << "  -speed        <number>       Run emulation at the given speed\n"
+    << "  -turbo        <1|0>          Enable 'Turbo' mode for maximum emulation speed\n"
     << "  -uimessages   <1|0>          Show onscreen UI messages for different events\n"
     << endl
   #ifdef SOUND_SUPPORT