Hook up new ystart autodetection.

src/emucore/Console.cxx

@@ -80,7 +80,8 @@ Console::Console(OSystem& osystem, unique_ptr<Cartridge>& cart,
     myCart(std::move(cart)),
     myDisplayFormat(""),  // Unknown TV format @ start
     myFramerate(0.0),     // Unknown framerate @ start
-    myCurrentFormat(0),   // Unknown format @ start
+    myCurrentFormat(0),   // Unknown format @ start,
+    myAutodetectedYstart(0),
     myUserPaletteDefined(false),
     myConsoleTiming(ConsoleTiming::ntsc)
 {
@@ -120,43 +121,17 @@ Console::Console(OSystem& osystem, unique_ptr<Cartridge>& cart,
 
   if(myDisplayFormat == "AUTO" || myOSystem.settings().getBool("rominfo"))
   {
-    // Run the TIA, looking for PAL scanline patterns
+    autodetectFrameLayout();
-    // We turn off the SuperCharger progress bars, otherwise the SC BIOS
-    // will take over 250 frames!
-    // The 'fastscbios' option must be changed before the system is reset
-    bool fastscbios = myOSystem.settings().getBool("fastscbios");
-    myOSystem.settings().setValue("fastscbios", true);
-
-    FrameLayoutDetector frameLayoutDetector;
-    myTIA->setFrameManager(&frameLayoutDetector);
-    mySystem->reset(true);
-
-    for(int i = 0; i < 60; ++i) myTIA->update();
-
-    myTIA->setFrameManager(myFrameManager.get());
-
-    myDisplayFormat = frameLayoutDetector.detectedLayout() == FrameLayout::pal ? "PAL" : "NTSC";
 
     if(myProperties.get(Display_Format) == "AUTO")
     {
       autodetected = "*";
       myCurrentFormat = 0;
     }
+  }
 
-    // Don't forget to reset the SC progress bars again
+  if (atoi(myProperties.get(Display_YStart).c_str()) == 0) {
-    myOSystem.settings().setValue("fastscbios", fastscbios);
+    autodetectYStart();
-
-    // TODO: move! move! move! (temporary for testing)
-    YStartDetector ystartDetector;
-    ystartDetector.setLayout(frameLayoutDetector.detectedLayout());
-    myTIA->setFrameManager(&ystartDetector);
-    mySystem->reset();
-
-    for (int i = 0; i < 80; i++) myTIA->update();
-
-    myTIA->setFrameManager(myFrameManager.get());
-
-    (cout << "detected ystart value: " << ystartDetector.detectedYStart() << std::endl).flush();
   }
 
   myConsoleInfo.DisplayFormat = myDisplayFormat + autodetected;
@@ -232,6 +207,54 @@ Console::~Console()
   myRightControl->close();
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void Console::autodetectFrameLayout()
+{
+  // Run the TIA, looking for PAL scanline patterns
+  // We turn off the SuperCharger progress bars, otherwise the SC BIOS
+  // will take over 250 frames!
+  // The 'fastscbios' option must be changed before the system is reset
+  bool fastscbios = myOSystem.settings().getBool("fastscbios");
+  myOSystem.settings().setValue("fastscbios", true);
+
+  FrameLayoutDetector frameLayoutDetector;
+  myTIA->setFrameManager(&frameLayoutDetector);
+  mySystem->reset(true);
+
+  for(int i = 0; i < 60; ++i) myTIA->update();
+
+  myTIA->setFrameManager(myFrameManager.get());
+
+  myDisplayFormat = frameLayoutDetector.detectedLayout() == FrameLayout::pal ? "PAL" : "NTSC";
+
+  // Don't forget to reset the SC progress bars again
+  myOSystem.settings().setValue("fastscbios", fastscbios);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void Console::autodetectYStart()
+{
+  // We turn off the SuperCharger progress bars, otherwise the SC BIOS
+  // will take over 250 frames!
+  // The 'fastscbios' option must be changed before the system is reset
+  bool fastscbios = myOSystem.settings().getBool("fastscbios");
+  myOSystem.settings().setValue("fastscbios", true);
+
+  YStartDetector ystartDetector;
+  ystartDetector.setLayout(myDisplayFormat == "PAL" ? FrameLayout::pal : FrameLayout::ntsc);
+  myTIA->setFrameManager(&ystartDetector);
+  mySystem->reset();
+
+  for (int i = 0; i < 80; i++) myTIA->update();
+
+  myTIA->setFrameManager(myFrameManager.get());
+
+  myAutodetectedYstart = ystartDetector.detectedYStart();
+
+  // Don't forget to reset the SC progress bars again
+  myOSystem.settings().setValue("fastscbios", fastscbios);
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 bool Console::save(Serializer& out) const
 {
@@ -593,11 +616,17 @@ void Console::changeYStart(int direction)
   }
   else if(direction == -1)  // decrease YStart
   {
-    if(ystart == TIAConstants::minYStart-1)
+    if (ystart == TIAConstants::minYStart && myAutodetectedYstart == 0) {
+      myOSystem.frameBuffer().showMessage("Autodetected YStart not available");
+      return;
+    }
+
+    if(ystart == TIAConstants::minYStart-1 && myAutodetectedYstart > 0)
     {
       myOSystem.frameBuffer().showMessage("YStart at minimum");
       return;
     }
+
     ystart--;
   }
   else
@@ -609,7 +638,7 @@ void Console::changeYStart(int direction)
     myOSystem.frameBuffer().showMessage("YStart autodetected");
   else
   {
-    if(myTIA->ystartIsAuto(ystart))
+    if(myAutodetectedYstart > 0 && myAutodetectedYstart == ystart)
     {
       // We've reached the auto-detect value, so reset
       myOSystem.frameBuffer().showMessage("YStart " + val.str() + " (Auto)");
@@ -688,7 +717,7 @@ void Console::setTIAProperties()
     myTIA->setLayout(FrameLayout::pal);
   }
 
-  myTIA->setYStart(ystart);
+  myTIA->setYStart(ystart != 0 ? ystart : myAutodetectedYstart);
   myTIA->setHeight(height);
 }
 

src/emucore/Console.hxx

@@ -305,6 +305,16 @@ class Console : public Serializable
     void toggleJitter() const;
 
   private:
+    /**
+     * Dry-run the emulation and detect the frame layout (PAL / NTSC).
+     */
+    void autodetectFrameLayout();
+
+    /**
+     * Dryrun the emulation and detect ystart (the first visible scanline).
+     */
+    void autodetectYStart();
+
     /**
       Sets various properties of the TIA (YStart, Height, etc) based on
       the current display format.
@@ -385,6 +395,9 @@ class Console : public Serializable
     // Display format currently in use
     uInt32 myCurrentFormat;
 
+    // Autodetected ystart.
+    uInt32 myAutodetectedYstart;
+
     // Indicates whether an external palette was found and
     // successfully loaded
     bool myUserPaletteDefined;

src/emucore/tia/TIA.hxx

@@ -206,7 +206,6 @@ class TIA : public Device
     uInt32 width() const  { return 160; }
     uInt32 height() const { return myFrameManager->height(); }
     uInt32 ystart() const { return myFrameManager->ystart(); }
-    bool ystartIsAuto(uInt32 line) const { return myFrameManager->ystartIsAuto(line); }
 
     /**
       Changes the current Height/YStart properties.

src/emucore/tia/frame-manager/AbstractFrameManager.hxx

@@ -185,11 +185,6 @@ class AbstractFrameManager : public Serializable
      */
     virtual uInt32 ystart() const { return 0; }
 
-    /**
-     * TODO: this looks pretty weird --- does this actually work?
-     */
-    virtual bool ystartIsAuto(uInt32 line) const { return false; }
-
     /**
      * Set the frame layout. This may be a noop (on the autodetection manager).
      */

src/emucore/tia/frame-manager/FrameManager.cxx

@@ -57,9 +57,6 @@ void FrameManager::onReset()
   myVsyncLines = 0;
   myY = 0;
   myFramePending = false;
-  myStabilizationFrames = 0;
-  myStableFrames = 0;
-  myHasStabilized = false;
 
   myStableFrameLines = -1;
   myStableFrameHeightCountdown = 0;
@@ -158,21 +155,6 @@ void FrameManager::setState(FrameManager::State state)
 
   switch (myState) {
     case State::waitForFrameStart:
-      if (!myHasStabilized) {
-        myHasStabilized =
-          myStableFrames >= Metrics::minStableFrames ||
-          myStabilizationFrames >= Metrics::maxStabilizationFrames;
-
-        updateIsRendering();
-
-        myStabilizationFrames++;
-
-        if (myVblankManager.isStable())
-          myStableFrames++;
-        else
-          myStableFrames = 0;
-      }
-
       if (myFramePending) finalizeFrame();
       notifyFrameStart();
 
@@ -297,7 +279,7 @@ void FrameManager::enableJitter(bool enabled)
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void FrameManager::updateIsRendering() {
-  myIsRendering = myState == State::frame && myHasStabilized;
+  myIsRendering = myState == State::frame;
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -312,10 +294,6 @@ bool FrameManager::onSave(Serializer& out) const
   out.putInt(myLastY);
   out.putBool(myFramePending);
 
-  out.putInt(myStableFrames);
-  out.putInt(myStabilizationFrames);
-  out.putBool(myHasStabilized);
-
   out.putInt(myVblankLines);
   out.putInt(myKernelLines);
   out.putInt(myOverscanLines);
@@ -343,10 +321,6 @@ bool FrameManager::onLoad(Serializer& in)
   myLastY = in.getInt();
   myFramePending = in.getBool();
 
-  myStableFrames = in.getInt();
-  myStabilizationFrames = in.getInt();
-  myHasStabilized = in.getBool();
-
   myVblankLines = in.getInt();
   myKernelLines = in.getInt();
   myOverscanLines = in.getInt();

src/emucore/tia/frame-manager/FrameManager.hxx

@@ -50,8 +50,6 @@ class FrameManager: public AbstractFrameManager {
 
     uInt32 ystart() const override { return myVblankManager.ystart(); }
 
-    bool ystartIsAuto(uInt32 line) const override { return myVblankManager.ystartIsAuto(line); };
-
     void setLayout(FrameLayout mode) override { layout(mode); }
 
     void onSetVblank() override;
@@ -103,10 +101,6 @@ class FrameManager: public AbstractFrameManager {
     uInt32 myY, myLastY;
     bool myFramePending;
 
-    uInt32 myStableFrames;
-    uInt32 myStabilizationFrames;
-    bool myHasStabilized;
-
     uInt32 myVblankLines;
     uInt32 myKernelLines;
     uInt32 myOverscanLines;