Fixed resetting of TIA when changing X/YStart and Width/Height. A full

TIA reset isn't required in this case, and isn't always correct.  Instead,
only the frame parameters should be reset.


git-svn-id: svn://svn.code.sf.net/p/stella/code/trunk@1271 8b62c5a3-ac7e-4cc8-8f21-d9a121418aba

stella/src/emucore/Console.cxx

@@ -13,7 +13,7 @@
 // See the file "license" for information on usage and redistribution of
 // this file, and for a DISCLAIMER OF ALL WARRANTIES.
 //
-// $Id: Console.cxx,v 1.120 2007-01-06 16:21:29 stephena Exp $
+// $Id: Console.cxx,v 1.121 2007-01-06 21:13:29 stephena Exp $
 //============================================================================
 
 #include <cassert>
@@ -483,7 +483,7 @@ void Console::changeXStart(int direction)
 
   strval << xstart;
   myProperties.set(Display_XStart, strval.str());
-  ((TIA*)myMediaSource)->recalc();
+  ((TIA*)myMediaSource)->frameReset();
   myOSystem->frameBuffer().refresh();
 
   message = "XStart ";
@@ -521,7 +521,7 @@ void Console::changeYStart(int direction)
 
   strval << ystart;
   myProperties.set(Display_YStart, strval.str());
-  ((TIA*)myMediaSource)->recalc();
+  ((TIA*)myMediaSource)->frameReset();
   myOSystem->frameBuffer().refresh();
 
   message = "YStart ";
@@ -565,7 +565,7 @@ void Console::changeWidth(int direction)
 
   strval << width;
   myProperties.set(Display_Width, strval.str());
-  ((TIA*)myMediaSource)->recalc();
+  ((TIA*)myMediaSource)->frameReset();
   initializeVideo();  // takes care of refreshing the screen
 
   message = "Width ";
@@ -603,7 +603,7 @@ void Console::changeHeight(int direction)
 
   strval << height;
   myProperties.set(Display_Height, strval.str());
-  ((TIA*)myMediaSource)->recalc();
+  ((TIA*)myMediaSource)->frameReset();
   initializeVideo();  // takes care of refreshing the screen
 
   message = "Height ";

stella/src/emucore/TIA.cxx

@@ -13,7 +13,7 @@
 // See the file "license" for information on usage and redistribution of
 // this file, and for a DISCLAIMER OF ALL WARRANTIES.
 //
-// $Id: TIA.cxx,v 1.77 2007-01-06 16:21:31 stephena Exp $
+// $Id: TIA.cxx,v 1.78 2007-01-06 21:13:29 stephena Exp $
 //============================================================================
 
 #include <cassert>
@@ -131,60 +131,6 @@ void TIA::reset()
   // Reset the sound device
   mySound->reset();
 
-  // Recalculate the size of the display
-  recalc();
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-void TIA::systemCyclesReset()
-{
-  // Get the current system cycle
-  uInt32 cycles = mySystem->cycles();
-
-  // Adjust the sound cycle indicator
-  mySound->adjustCycleCounter(-1 * cycles);
-
-  // Adjust the dump cycle
-  myDumpDisabledCycle -= cycles;
-
-  // Get the current color clock the system is using
-  uInt32 clocks = cycles * 3;
-
-  // Adjust the clocks by this amount since we're reseting the clock to zero
-  myClockWhenFrameStarted -= clocks;
-  myClockStartDisplay -= clocks;
-  myClockStopDisplay -= clocks;
-  myClockAtLastUpdate -= clocks;
-  myVSYNCFinishClock -= clocks;
-  myLastHMOVEClock -= clocks;
-}
- 
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-void TIA::recalc()
-{
-  // Clear frame buffers
-  clearBuffers();
-
-  // Reset pixel pointer and drawing flag
-  myFramePointer = myCurrentFrameBuffer;
-
-  myYStart = atoi(myConsole.properties().get(Display_YStart).c_str());
-  myHeight = atoi(myConsole.properties().get(Display_Height).c_str());
-
-  // Calculate color clock offsets for starting and stoping frame drawing
-  myStartDisplayOffset = 228 * myYStart;
-  myStopDisplayOffset = myStartDisplayOffset + 228 * myHeight;
-
-  // Reasonable values to start and stop the current frame drawing
-  myClockWhenFrameStarted = mySystem->cycles() * 3;
-  myClockStartDisplay = myClockWhenFrameStarted + myStartDisplayOffset;
-  myClockStopDisplay = myClockWhenFrameStarted + myStopDisplayOffset;
-  myClockAtLastUpdate = myClockWhenFrameStarted;
-  myClocksToEndOfScanLine = 228;
-  myVSYNCFinishClock = 0x7FFFFFFF;
-  myScanlineCountForLastFrame = 0;
-  myCurrentScanline = 0;
-
   // Currently no objects are enabled
   myEnabledObjects = 0;
 
@@ -250,6 +196,47 @@ void TIA::recalc()
   myAllowHMOVEBlanks = 
       (myConsole.properties().get(Emulation_HmoveBlanks) == "YES");
 
+  if(myConsole.getFormat().compare(0, 3, "PAL") == 0)
+  {
+    myColorLossEnabled = true;
+    myMaximumNumberOfScanlines = 342;
+  }
+  else  // NTSC
+  {
+    myColorLossEnabled = false;
+    myMaximumNumberOfScanlines = 290;
+  }
+
+  // Recalculate the size of the display
+  frameReset();
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void TIA::frameReset()
+{
+  // Clear frame buffers
+  clearBuffers();
+
+  // Reset pixel pointer and drawing flag
+  myFramePointer = myCurrentFrameBuffer;
+
+  myYStart = atoi(myConsole.properties().get(Display_YStart).c_str());
+  myHeight = atoi(myConsole.properties().get(Display_Height).c_str());
+
+  // Calculate color clock offsets for starting and stoping frame drawing
+  myStartDisplayOffset = 228 * myYStart;
+  myStopDisplayOffset = myStartDisplayOffset + 228 * myHeight;
+
+  // Reasonable values to start and stop the current frame drawing
+  myClockWhenFrameStarted = mySystem->cycles() * 3;
+  myClockStartDisplay = myClockWhenFrameStarted + myStartDisplayOffset;
+  myClockStopDisplay = myClockWhenFrameStarted + myStopDisplayOffset;
+  myClockAtLastUpdate = myClockWhenFrameStarted;
+  myClocksToEndOfScanLine = 228;
+  myVSYNCFinishClock = 0x7FFFFFFF;
+  myScanlineCountForLastFrame = 0;
+  myCurrentScanline = 0;
+
   myFrameXStart = atoi(myConsole.properties().get(Display_XStart).c_str());
   myFrameWidth  = atoi(myConsole.properties().get(Display_Width).c_str());
   myFrameYStart = atoi(myConsole.properties().get(Display_YStart).c_str());
@@ -270,19 +257,32 @@ void TIA::recalc()
     // Values are illegal so reset to default values
     myFrameHeight = 200;
   }
-
-  if(myConsole.getFormat().compare(0, 3, "PAL") == 0)
-  {
-    myColorLossEnabled = true;
-    myMaximumNumberOfScanlines = 342;
-  }
-  else  // NTSC
-  {
-    myColorLossEnabled = false;
-    myMaximumNumberOfScanlines = 290;
-  }
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void TIA::systemCyclesReset()
+{
+  // Get the current system cycle
+  uInt32 cycles = mySystem->cycles();
+
+  // Adjust the sound cycle indicator
+  mySound->adjustCycleCounter(-1 * cycles);
+
+  // Adjust the dump cycle
+  myDumpDisabledCycle -= cycles;
+
+  // Get the current color clock the system is using
+  uInt32 clocks = cycles * 3;
+
+  // Adjust the clocks by this amount since we're reseting the clock to zero
+  myClockWhenFrameStarted -= clocks;
+  myClockStartDisplay -= clocks;
+  myClockStopDisplay -= clocks;
+  myClockAtLastUpdate -= clocks;
+  myVSYNCFinishClock -= clocks;
+  myLastHMOVEClock -= clocks;
+}
+ 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void TIA::install(System& system)
 {

stella/src/emucore/TIA.hxx

@@ -13,7 +13,7 @@
 // See the file "license" for information on usage and redistribution of
 // this file, and for a DISCLAIMER OF ALL WARRANTIES.
 //
-// $Id: TIA.hxx,v 1.40 2007-01-06 16:21:31 stephena Exp $
+// $Id: TIA.hxx,v 1.41 2007-01-06 21:13:29 stephena Exp $
 //============================================================================
 
 #ifndef TIA_HXX
@@ -42,7 +42,7 @@ class Settings;
   be displayed on screen.
 
   @author  Bradford W. Mott
-  @version $Id: TIA.hxx,v 1.40 2007-01-06 16:21:31 stephena Exp $
+  @version $Id: TIA.hxx,v 1.41 2007-01-06 21:13:29 stephena Exp $
 */
 class TIA : public Device , public MediaSource
 {
@@ -75,6 +75,11 @@ class TIA : public Device , public MediaSource
     */
     virtual void reset();
 
+    /**
+      Reset frame to change XStart/YStart/Width/Height properties
+    */
+    virtual void frameReset();
+
     /**
       Notification method invoked by the system right before the
       system resets its cycle counter to zero.  It may be necessary
@@ -82,11 +87,6 @@ class TIA : public Device , public MediaSource
     */
     virtual void systemCyclesReset();
 
-    /**
-      Recalculate set XStart/YStart/Width/Height properties
-    */
-    virtual void recalc();
-
     /**
       Install TIA in the specified system.  Invoked by the system
       when the TIA is attached to it.