Connect tia.filter.

src/common/FBSurfaceSDL2.cxx

@@ -249,3 +249,12 @@ void FBSurfaceSDL2::applyAttributes()
 {
   reinitializeBlitter();
 }
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void FBSurfaceSDL2::setScalingInterpolation(FrameBuffer::ScalingInterpolation interpolation)
+{
+  if (interpolation == myInterpolationMode) return;
+
+  myInterpolationMode = interpolation;
+  reload();
+}

src/common/FBSurfaceSDL2.hxx

@@ -62,6 +62,8 @@ class FBSurfaceSDL2 : public FBSurface
     void reload() override;
     void resize(uInt32 width, uInt32 height) override;
 
+    void setScalingInterpolation(FrameBuffer::ScalingInterpolation) override;
+
   protected:
     void applyAttributes() override;
 
@@ -81,7 +83,7 @@ class FBSurfaceSDL2 : public FBSurface
     FrameBufferSDL2& myFB;
 
     unique_ptr<Blitter> myBlitter;
-    const FrameBuffer::ScalingInterpolation myInterpolationMode;
+    FrameBuffer::ScalingInterpolation myInterpolationMode;
 
     SDL_Surface* mySurface;
     SDL_Rect mySrcR, myDstR;

src/emucore/FBSurface.hxx

@@ -29,6 +29,7 @@ namespace Common {
 }
 
 #include "FrameBufferConstants.hxx"
+#include "FrameBuffer.hxx"
 #include "bspf.hxx"
 
 /**
@@ -335,6 +336,11 @@ class FBSurface
     */
     Attributes& attributes() { return myAttributes; }
 
+    /**
+      Configure scaling interpolation.
+     */
+    virtual void setScalingInterpolation(FrameBuffer::ScalingInterpolation) = 0;
+
     /**
       The child class chooses which (if any) of the actual attributes
       can be applied.

src/emucore/FrameBuffer.cxx

@@ -293,6 +293,8 @@ FBInitStatus FrameBuffer::createDisplay(const string& title,
       Logger::info(post_about);
   }
 
+  if (myTIASurface) myTIASurface->updateSurfaceSettings();
+
   return FBInitStatus::Success;
 }
 

src/emucore/TIASurface.cxx

@@ -25,6 +25,19 @@
 #include "PNGLibrary.hxx"
 #include "TIASurface.hxx"
 
+namespace {
+  FrameBuffer::ScalingInterpolation interpolationModeFromSettings(const Settings& settings)
+  {
+    const string setting = settings.getString("tia.filter");
+
+    if (setting == "sharp") return FrameBuffer::ScalingInterpolation::sharp;
+    if (setting == "soft") return FrameBuffer::ScalingInterpolation::blur;
+    if (setting == "none") return FrameBuffer::ScalingInterpolation::none;
+
+    return FrameBuffer::ScalingInterpolation::sharp;
+  }
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 TIASurface::TIASurface(OSystem& system)
   : myOSystem(system),
@@ -44,7 +57,7 @@ TIASurface::TIASurface(OSystem& system)
   myTiaSurface = myFB.allocateSurface(
     AtariNTSC::outWidth(TIAConstants::frameBufferWidth),
     TIAConstants::frameBufferHeight,
-    FrameBuffer::ScalingInterpolation::sharp
+    interpolationModeFromSettings(myOSystem.settings())
   );
 
   // Generate scanline data, and a pre-defined scanline surface
@@ -55,7 +68,7 @@ TIASurface::TIASurface(OSystem& system)
     scanData[i]   = 0x00000000;
     scanData[i+1] = 0xff000000;
   }
-  mySLineSurface = myFB.allocateSurface(1, scanHeight, FrameBuffer::ScalingInterpolation::sharp, scanData);
+  mySLineSurface = myFB.allocateSurface(1, scanHeight, interpolationModeFromSettings(myOSystem.settings()), scanData);
 
   // Base TIA surface for use in taking snapshots in 1x mode
   myBaseTiaSurface = myFB.allocateSurface(TIAConstants::frameBufferWidth*2,
@@ -458,3 +471,10 @@ void TIASurface::renderForSnapshot()
       mySLineSurface->render();
   }
 }
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void TIASurface::updateSurfaceSettings()
+{
+  myTiaSurface->setScalingInterpolation(interpolationModeFromSettings(myOSystem.settings()));
+  mySLineSurface->setScalingInterpolation(interpolationModeFromSettings(myOSystem.settings()));
+}

src/emucore/TIASurface.hxx

@@ -156,6 +156,11 @@ class TIASurface
     */
     void saveSnapShot() { mySaveSnapFlag = true; }
 
+    /**
+      Update surface settings.
+     */
+    void updateSurfaceSettings();
+
   private:
     /**
       Average current calculated buffer's pixel with previous calculated buffer's pixel (50:50).

src/libretro/FBSurfaceLIBRETRO.hxx

@@ -56,6 +56,7 @@ class FBSurfaceLIBRETRO : public FBSurface
     void free() override { }
     void reload() override { }
     void resize(uInt32 width, uInt32 height) override { }
+    void setScalingInterpolation(FrameBuffer::ScalingInterpolation) override { }
 
   protected:
     void applyAttributes() override { }