Allow to switch between TIA implementations via command line / config.

.vscode/settings.json

@@ -15,5 +15,7 @@
             "**/.hg": true,
             "**/.DS_Store": true,
             "src/**/*.o": true
-        }
+        },
+        "editor.trimAutoWhitespace": true,
+        "editor.useTabStops": false
 }

src/emucore/Console.cxx

@@ -20,6 +20,7 @@
 #include <cassert>
 #include <iostream>
 #include <sstream>
+#include <stdexcept>
 #include <fstream>
 
 #include "AtariVox.hxx"
@@ -83,7 +84,7 @@ Console::Console(OSystem& osystem, unique_ptr<Cartridge>& cart,
   // Create subsystems for the console
   my6502 = make_ptr<M6502>(myOSystem.settings());
   myRiot = make_ptr<M6532>(*this, myOSystem.settings());
-  myTIA  = make_ptr<TIADefaultCore::TIA>(*this, myOSystem.sound(), myOSystem.settings());
+  myTIA  = unique_ptr<AbstractTIA>(createTIA());
   mySwitches = make_ptr<Switches>(myEvent, myProperties);
 
   // Construct the system and components
@@ -537,6 +538,31 @@ void Console::changeHeight(int direction)
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+AbstractTIA* Console::createTIA()
+{
+  string coreType = "default";
+
+#ifdef SUPPORT_6502TS_TIA
+  coreType = myOSystem.settings().getString("tia.core");
+#endif
+
+  if (coreType == "default") {
+    myOSystem.logMessage("using default TIA core", 1);
+    return new TIADefaultCore::TIA(*this, myOSystem.sound(), myOSystem.settings());
+  }
+
+  if (coreType == "6502ts") {
+    myOSystem.logMessage("using 6502.ts TIA core", 1);
+    return 0;
+  }
+
+  ostringstream buffer;
+
+  buffer << "invalid TIA core type " << coreType;
+  throw new runtime_error(buffer.str());
+}
+
 void Console::setTIAProperties()
 {
   // TODO - query these values directly from the TIA if value is 'AUTO'

src/emucore/Console.hxx

@@ -286,6 +286,12 @@ class Console : public Serializable
     void toggleJitter() const;
 
   private:
+
+    /**
+      Create the TIA
+    */
+    AbstractTIA* createTIA();
+
     /**
       Sets various properties of the TIA (YStart, Height, etc) based on
       the current display format.

src/emucore/Settings.cxx

@@ -48,6 +48,9 @@ Settings::Settings(OSystem& osystem)
   setInternal("uimessages", "true");
 
   // TIA specific options
+#ifdef SUPPORT_6502TS_TIA
+  setInternal("tia.core", "default");
+#endif
   setInternal("tia.zoom", "2");
   setInternal("tia.inter", "false");
   setInternal("tia.aspectn", "90");
@@ -324,6 +327,12 @@ void Settings::validate()
   i = getInt("loglevel");
   if(i < 0 || i > 2)
     setInternal("loglevel", "1");
+
+#ifdef SUPPORT_6502TS_TIA
+  s = getString("tia.core");
+  if (s != "6502ts" && s != "default") setInternal("tia.core", "default");
+#endif
+
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -364,6 +373,10 @@ void Settings::usage() const
     << "  -freq         <number>       Set sound sample output frequency (11025|22050|31400|44100|48000)\n"
     << "  -volume       <number>       Set the volume (0 - 100)\n"
     << endl
+  #endif
+  #ifdef SUPPORT_6502TS_TIA
+    << "  -tia.core     <default|\n"
+    << "                 6502ts>       Select the TIA core\n"
   #endif
     << "  -tia.zoom     <zoom>         Use the specified zoom level (windowed mode) for TIA image\n"
     << "  -tia.inter    <1|0>          Enable interpolated (smooth) scaling for TIA image\n"