CPU registers can be selectively randomized with cpurandom option.

git-svn-id: svn://svn.code.sf.net/p/stella/code/trunk@3014 8b62c5a3-ac7e-4cc8-8f21-d9a121418aba

Changes.txt

@@ -27,18 +27,20 @@
     and they will be added and removed automatically.  Also fixed is
     a bug whereby sometimes custom joystick mappings weren't being saved.
 
-  * The 'cpurandom' option now also randomizes the SP register, and the
+  * The 'cpurandom' option is now broken down by register type, so you
-    randomization is now disabled by default.  If you are experiencing
+    can selectively enable/disable randomization for each one.  The
-    weird graphics corruption, display problems, etc, consider disabling
+    default is to disable randomization for all registers.
-    this option.
 
   * Fixed 'MDM' scheme to trigger bankswitching on writes to hotspots
     (previously it only triggered on reads).  Also, the scheme has been
     modified as originally designed by E. Blink; hotspots are now in the
     range $800-$BFF instead of $800-$FFF.
 
-  * The OSX app icon now includes 32x32 and 16x16 versions, so 'small'
+  * The OSX app-icon now includes 32x32 and 16x16 versions, so 'small'
-    icons will be viewable in Finder, Get Info, etc.
+    icons will be viewable in 'Finder', 'Get Info', etc.
+
+  * The Linux port now uses an app-icon; this seems to be needed for
+    some window managers.
 
 -Have fun!
 

docs/index.html

@@ -2246,8 +2246,8 @@
     </tr>
 
     <tr>
-      <td><pre>-cpurandom &lt;1|0&gt;</pre></td>
+      <td><pre>-cpurandom &lt;S,A,X,Y,P&gt;</pre></td>
-      <td>On reset, randomize the content CPU registers.</td>
+      <td>On reset, randomize the content of the specified CPU registers.</td>
     </tr>
 
     <tr>

src/debugger/gui/RiotWidget.cxx

@@ -218,21 +218,30 @@ RiotWidget::RiotWidget(GuiObject* boss, const GUI::Font& lfont,
       lfont.getStringWidth("When loading a ROM:"), fontHeight, 
       "When loading a ROM:", kTextAlignLeft);
 
-  // Randomize CPU
-  xpos += 30;  ypos += lineHeight + 4;
-  myRandomizeCPU = new CheckboxWidget(boss, lfont, xpos, ypos+1,
-      "Randomize CPU registers (SP/A/X/Y/PS)", kCheckActionCmd);
-  myRandomizeCPU->setID(kRandCPUID);
-  myRandomizeCPU->setTarget(this);
-  addFocusWidget(myRandomizeCPU);
-
   // Randomize RAM
-  ypos += lineHeight + 4;
+  xpos += 30;  ypos += lineHeight + 4;
   myRandomizeRAM = new CheckboxWidget(boss, lfont, xpos, ypos+1,
       "Randomize zero-page and extended RAM", kCheckActionCmd);
   myRandomizeRAM->setID(kRandRAMID);
   myRandomizeRAM->setTarget(this);
   addFocusWidget(myRandomizeRAM);
+
+  // Randomize CPU
+  ypos += lineHeight + 8;
+  lwidth = lfont.getStringWidth("Randomize CPU ");
+  new StaticTextWidget(boss, lfont, xpos, ypos+1,
+      lwidth, fontHeight, "Randomize CPU ", kTextAlignLeft);
+  xpos += lwidth + 10;
+  const char* cpuregs[] = { "SP", "A", "X", "Y", "PS" };
+  for(int i = 0; i < 5; ++i)
+  {
+    myRandomizeCPU[i] = new CheckboxWidget(boss, lfont, xpos, ypos+1,
+      cpuregs[i], kCheckActionCmd);
+    myRandomizeCPU[i]->setID(kRandCPUID);
+    myRandomizeCPU[i]->setTarget(this);
+    addFocusWidget(myRandomizeCPU[i]);
+    xpos += CheckboxWidget::boxSize() + lfont.getStringWidth("XX") + 20;
+  }
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -335,8 +344,12 @@ void RiotWidget::loadConfig()
   myLeftControl->loadConfig();
   myRightControl->loadConfig();
 
-  myRandomizeCPU->setState(instance().settings().getBool("cpurandom"));
   myRandomizeRAM->setState(instance().settings().getBool("ramrandom"));
+
+  const string& cpurandom = instance().settings().getString("cpurandom");
+  const char* cpuregs[] = { "S", "A", "X", "Y", "P" };
+  for(int i = 0; i < 5; ++i)
+    myRandomizeCPU[i]->setState(BSPF_containsIgnoreCase(cpurandom, cpuregs[i]));
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -401,12 +414,12 @@ void RiotWidget::handleCommand(CommandSender* sender, int cmd, int data, int id)
         case kResetID:
           riot.reset(!myReset->getState());
           break;
-        case kRandCPUID:
-          instance().settings().setValue("cpurandom", myRandomizeCPU->getState());
-          break;
         case kRandRAMID:
           instance().settings().setValue("ramrandom", myRandomizeRAM->getState());
           break;
+        case kRandCPUID:
+          handleRandomCPU();
+          break;
       }
       break;
 
@@ -450,3 +463,15 @@ ControllerWidget* RiotWidget::addControlWidget(GuiObject* boss, const GUI::Font&
       return new NullControlWidget(boss, font, x, y, controller);
   }
 }
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void RiotWidget::handleRandomCPU()
+{
+  string cpurandom;
+  const char* cpuregs[] = { "S", "A", "X", "Y", "P" };
+  for(int i = 0; i < 5; ++i)
+    if(myRandomizeCPU[i]->getState())
+      cpurandom += cpuregs[i];
+
+  instance().settings().setValue("cpurandom", cpurandom);
+}

src/debugger/gui/RiotWidget.hxx

@@ -45,6 +45,8 @@ class RiotWidget : public Widget, public CommandSender
     ControllerWidget* addControlWidget(GuiObject* boss, const GUI::Font& font,
         int x, int y, Controller& controller);
 
+    void handleRandomCPU();
+
   private:
     ToggleBitWidget* mySWCHAReadBits;
     ToggleBitWidget* mySWCHAWriteBits;
@@ -67,7 +69,7 @@ class RiotWidget : public Widget, public CommandSender
     CheckboxWidget* mySelect;
     CheckboxWidget* myReset;
 
-    CheckboxWidget* myRandomizeCPU;
+    CheckboxWidget* myRandomizeCPU[5];
     CheckboxWidget* myRandomizeRAM;
 
     // ID's for the various widgets

src/emucore/M6502.cxx

@@ -109,22 +109,18 @@ void M6502::reset()
   // Clear the execution status flags
   myExecutionStatus = 0;
 
-  // Set registers to default values
+  // Set registers to random or default values
-  SP = 0xff;
+  const string& cpurandom = mySettings.getString("cpurandom");
-  if(mySettings.getBool("cpurandom"))
+  SP = BSPF_containsIgnoreCase(cpurandom, "S") ?
-  {
+          mySystem->randGenerator().next() : 0xff;
-    SP = mySystem->randGenerator().next();
+  A  = BSPF_containsIgnoreCase(cpurandom, "A") ?
-    A  = mySystem->randGenerator().next();
+          mySystem->randGenerator().next() : 0x00;
-    X  = mySystem->randGenerator().next();
+  X  = BSPF_containsIgnoreCase(cpurandom, "X") ?
-    Y  = mySystem->randGenerator().next();
+          mySystem->randGenerator().next() : 0x00;
-    PS(mySystem->randGenerator().next());
+  Y  = BSPF_containsIgnoreCase(cpurandom, "Y") ?
-  }
+          mySystem->randGenerator().next() : 0x00;
-  else
+  PS(BSPF_containsIgnoreCase(cpurandom, "P") ?
-  {
+          mySystem->randGenerator().next() : 0x20);
-    SP = 0xff;
-    A = X = Y = 0;
-    PS(0x20);
-  }
 
   // Reset access flag
   myLastAccessWasRead = true;

src/emucore/Settings.cxx

@@ -130,7 +130,7 @@ Settings::Settings(OSystem& osystem)
   setInternal("loglevel", "1");
   setInternal("logtoconsole", "0");
   setInternal("tiadriven", "false");
-  setInternal("cpurandom", "false");
+  setInternal("cpurandom", "");
   setInternal("ramrandom", "true");
   setInternal("avoxport", "");
   setInternal("stats", "false");