Fix blur emulation in the accurate PPU mode.

bsnes/sfc/ppu/ppu.cpp

@@ -250,6 +250,16 @@ auto PPU::refresh() -> void {
   auto pitch  = 512;
   auto width  = 512;
   auto height = 480;
+  if(configuration.video.blurEmulation) {
+    for(uint y : range(height)) {
+      auto data = output + y * pitch;
+      for(uint x : range(width - 1)) {
+        auto a = data[x + 0];
+        auto b = data[x + 1];
+        data[x] = (a + b - ((a ^ b) & 0x0421)) >> 1;
+      }
+    }
+  }
   if(auto device = controllerPort2.device) device->draw(output, pitch * sizeof(uint16), width, height);
   platform->videoFrame(output, pitch * sizeof(uint16), width, height, /* scale = */ 1);
 }

bsnes/target-bsnes/presentation/presentation.cpp

@@ -50,7 +50,7 @@ auto Presentation::create() -> void {
   });
   blurEmulation.setText("Blur Emulation").setChecked(settings.video.blur).onToggle([&] {
     settings.video.blur = blurEmulation.checked();
-    emulator->configure("Video/BlurEmulation", blurEmulation.checked());
+    emulator->configure("Video/BlurEmulation", settings.video.blur);
   }).doToggle();
   filterMenu.setIcon(Icon::Emblem::Image).setText("Filter");
   filterNone.setText("None").onActivate([&] { settings.video.filter = "None"; });

bsnes/target-bsnes/program/game.cpp

@@ -70,6 +70,7 @@ auto Program::load() -> void {
   presentation.addRecentGame(games.trimRight("|", 1L));
 
   updateVideoPalette();
+  updateVideoEffects();
   updateAudioEffects();
   updateAudioFrequency();
 }

bsnes/target-bsnes/program/program.hpp

@@ -95,6 +95,7 @@ struct Program : Lock, Emulator::Platform {
   auto updateVideoFormat() -> void;
   auto updateVideoShader() -> void;
   auto updateVideoPalette() -> void;
+  auto updateVideoEffects() -> void;
 
   //audio.cpp
   auto updateAudioDriver(Window parent) -> void;

bsnes/target-bsnes/program/video.cpp

@@ -110,3 +110,7 @@ auto Program::updateVideoPalette() -> void {
 
   emulator->configure("Video/ColorEmulation", false);
 }
+
+auto Program::updateVideoEffects() -> void {
+  emulator->configure("Video/BlurEmulation", settings.video.blur);
+}