improved UI and doc for interpolation (unavailable for Software renderer)

docs/index.html

@@ -1429,7 +1429,7 @@
       <td>Control + F</td>
     </tr>
     <tr>
-      <td>Toggle display interpolation</td>
+      <td>Toggle display interpolation (not available for Software renderer)</td>
       <td>Control + I</td>
       <td>Control + I</td>
     </tr>
@@ -2845,7 +2845,7 @@
     <tr>
       <td><pre>-tia.inter &lt;1|0&gt;</pre></td>
       <td>Use interpolation for the TIA image (results in blending/smoothing
-        of the image).</td>
+        of the image, not available for Software renderer).</td>
     </tr>
 
     <tr>
@@ -3707,7 +3707,7 @@
         <table border="1" cellpadding="4">
           <tr><th>Item</th><th>Brief description</th><th>For more information,<br>see <a href="#CommandLine">Command Line</a></th></tr>
           <tr><td>Renderer</td><td>Use specified rendering mode.</td><td>-video</td></tr>
-          <tr><td>Interpolation</td><td>Enable interpolation of the TIA image.</td><td>-tia.inter</td></tr>
+          <tr><td>Interpolation</td><td>Enable interpolation of the TIA image (not available for Software renderer).</td><td>-tia.inter</td></tr>
           <tr><td>Zoom</td><td>Adjust the zoom level of the TIA image</td><td>-tia.zoom</td></tr>
           <tr><td>Fullscreen</td><td>Self-explanatory - Note that colors may slightly change.
                   This depends on the OS and renderer used.</td><td>-fullscreen</td></tr>

src/emucore/Console.cxx

@@ -514,19 +514,25 @@ void Console::enableColorLoss(bool state)
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void Console::toggleInter(bool toggle)
 {
-  bool enabled = myOSystem.settings().getBool("tia.inter");
+  if(myOSystem.settings().getString("video") != "software")
+  {
+    bool enabled = myOSystem.settings().getBool("tia.inter");
 
-  if(toggle)
-    enabled = !enabled;
+    if(toggle)
+      enabled = !enabled;
 
-  myOSystem.settings().setValue("tia.inter", enabled);
+    myOSystem.settings().setValue("tia.inter", enabled);
 
-  // ... and apply potential setting changes to the TIA surface
-  myOSystem.frameBuffer().tiaSurface().updateSurfaceSettings();
-  ostringstream ss;
+    // ... and apply potential setting changes to the TIA surface
+    myOSystem.frameBuffer().tiaSurface().updateSurfaceSettings();
+    ostringstream ss;
 
-  ss << "Interpolation " << (enabled ? "enabled" : "disabled");
-  myOSystem.frameBuffer().showTextMessage(ss.str());
+    ss << "Interpolation " << (enabled ? "enabled" : "disabled");
+    myOSystem.frameBuffer().showTextMessage(ss.str());
+  }
+  else
+    myOSystem.frameBuffer().showTextMessage(
+      "Interpolation not available for Software renderer");
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

src/emucore/EventHandler.cxx

@@ -420,6 +420,8 @@ bool EventHandler::skipAVSetting() const
     myOSystem.settings().getString("palette") == PaletteHandler::SETTING_CUSTOM;
   const bool isCustomFilter =
     myOSystem.settings().getInt("tv.filter") == int(NTSCFilter::Preset::CUSTOM);
+  const bool isSoftwareRenderer =
+    myOSystem.settings().getString("video") == "software";
 
   return (myAdjustSetting == AdjustSetting::OVERSCAN && !isFullScreen)
   #ifdef ADAPTABLE_REFRESH_SUPPORT
@@ -430,7 +432,8 @@ bool EventHandler::skipAVSetting() const
         && !isCustomPalette)
     || (myAdjustSetting >= AdjustSetting::NTSC_SHARPNESS
         && myAdjustSetting <= AdjustSetting::NTSC_BLEEDING
-        && !isCustomFilter);
+        && !isCustomFilter)
+    || (myAdjustSetting == AdjustSetting::INTERPOLATION && isSoftwareRenderer);
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

src/gui/VideoAudioDialog.cxx

@@ -121,7 +121,7 @@ void VideoAudioDialog::addDisplayTab()
   // Video renderer
   myRenderer = new PopUpWidget(myTab, _font, xpos, ypos, pwidth, lineHeight,
                                instance().frameBuffer().supportedRenderers(),
-                               "Renderer ", lwidth);
+                               "Renderer ", lwidth, kRendererChanged);
   myRenderer->setToolTip("Select renderer used for displaying screen.");
   wid.push_back(myRenderer);
   const int swidth = myRenderer->getWidth() - lwidth;
@@ -544,6 +544,7 @@ void VideoAudioDialog::loadConfig()
   // Display tab
   // Renderer settings
   myRenderer->setSelected(settings.getString("video"), "default");
+  handleRendererChanged();
 
   // TIA interpolation
   myTIAInterpolate->setState(settings.getBool("tia.inter"));
@@ -945,6 +946,13 @@ void VideoAudioDialog::loadTVAdjustables(NTSCFilter::Preset preset)
   myTVBleed->setValue(adj.bleed);
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void VideoAudioDialog::handleRendererChanged()
+{
+  bool enable = myRenderer->getSelectedTag().toString() != "software";
+  myTIAInterpolate->setEnabled(enable);
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void VideoAudioDialog::handlePaletteChange()
 {
@@ -1093,6 +1101,10 @@ void VideoAudioDialog::handleCommand(CommandSender* sender, int cmd,
       handleShiftChanged(myTVBlueShift);
       break;
 
+    case kRendererChanged:
+      handleRendererChanged();
+      break;
+
     case kVSizeChanged:
     {
       int adjust = myVSizeAdjust->getValue();

src/gui/VideoAudioDialog.hxx

@@ -52,6 +52,7 @@ class VideoAudioDialog : public Dialog
     void addAudioTab();
     void handleTVModeChange(NTSCFilter::Preset);
     void loadTVAdjustables(NTSCFilter::Preset preset);
+    void handleRendererChanged();
     void handlePaletteChange();
     void handleShiftChanged(SliderWidget* widget);
     void handlePaletteUpdate();
@@ -136,6 +137,7 @@ class VideoAudioDialog : public Dialog
     PaletteHandler::Adjustable myPaletteAdj;
 
     enum {
+      kRendererChanged    = 'VDRe',
       kZoomChanged        = 'VDZo',
       kVSizeChanged       = 'VDVs',
       kFullScreenChanged  = 'VDFs',