desktop-ui: rename FPS to VPS (VBlanks Per Second) to better represent what it is really showing

desktop-ui/program/platform.cpp

@@ -121,14 +121,14 @@ auto Program::video(ares::Node::Video::Screen node, const u32* data, u32 pitch,
   }
   ruby::video.unlock();
 
-  static u64 frameCounter = 0, previous, current;
-  frameCounter++;
+  static u64 vblankCounter = 0, previous, current;
+  vblankCounter++;
 
   current = chrono::timestamp();
   if(current != previous) {
     previous = current;
-    framesPerSecond = frameCounter;
-    frameCounter = 0;
+    vblanksPerSecond = vblankCounter;
+    vblankCounter = 0;
   }
 }
 

desktop-ui/program/program.hpp

@@ -94,7 +94,7 @@ struct Program : ares::Platform {
   } message;
 
   vector<Message> messages;
-  maybe<u64> framesPerSecond;
+  maybe<u64> vblanksPerSecond;
 };
 
 extern Program program;

desktop-ui/program/status.cpp

@@ -8,9 +8,9 @@ auto Program::updateMessage() -> void {
     }
   }
 
-  if(framesPerSecond) {
-     presentation.statusRight.setText({framesPerSecond(), " FPS"});
-     framesPerSecond.reset();
+  if(vblanksPerSecond) {
+    presentation.statusRight.setText({vblanksPerSecond(), " VPS"});
+    vblanksPerSecond.reset();
   }
 
   if(!emulator) {