FPS counter

src/lib.rs

@@ -23,7 +23,7 @@ use crate::framework::vfs::PhysicalFS;
 use crate::scene::loading_scene::LoadingScene;
 use crate::scene::Scene;
 use crate::scripting::tsc::text_script::ScriptMode;
-use crate::shared_game_state::{SharedGameState, TimingMode};
+use crate::shared_game_state::{Fps, SharedGameState, TimingMode};
 use crate::texture_set::{G_MAG, I_MAG};
 
 mod bmfont;
@@ -82,6 +82,7 @@ pub struct Game {
     last_tick: u128,
     next_tick: u128,
     loops: u64,
+    fps: Fps,
 }
 
 impl Game {
@@ -94,6 +95,7 @@ impl Game {
             last_tick: 0,
             next_tick: 0,
             loops: 0,
+            fps: Fps::new(),
         };
 
         Ok(s)
@@ -191,6 +193,10 @@ impl Game {
                 )?;
             }
 
+            if state_ref.settings.fps_counter {
+                self.fps.act(state_ref, ctx, self.last_tick)?;
+            }
+
             self.ui.draw(state_ref, ctx, scene)?;
         }
 

src/settings.rs

@@ -41,6 +41,8 @@ pub struct Settings {
     pub infinite_booster: bool,
     #[serde(skip)]
     pub debug_outlines: bool,
+    #[serde(skip, default = "default_true")]
+    pub fps_counter: bool,
 }
 
 fn default_true() -> bool { true }
@@ -131,6 +133,7 @@ impl Default for Settings {
             god_mode: false,
             infinite_booster: false,
             debug_outlines: false,
+            fps_counter: true,
         }
     }
 }

src/shared_game_state.rs

@@ -6,6 +6,7 @@ use chrono::{Datelike, Local};
 use crate::bmfont_renderer::BMFontRenderer;
 use crate::caret::{Caret, CaretType};
 use crate::common::{ControlFlags, Direction, FadeState};
+use crate::components::draw_common::{draw_number, Alignment};
 use crate::engine_constants::EngineConstants;
 use crate::framework::backend::BackendTexture;
 use crate::framework::context::Context;
@@ -65,6 +66,30 @@ impl TimingMode {
     }
 }
 
+pub struct Fps {
+    pub frame_count: u32,
+    pub fps: u32,
+    last_capture: u128,
+}
+
+impl Fps {
+    pub fn new() -> Fps {
+        Fps { frame_count: 0, fps: 0, last_capture: 0 }
+    }
+
+    pub fn act(&mut self, state: &mut SharedGameState, ctx: &mut Context, time: u128) -> GameResult {
+        if time - self.last_capture > 1000000000 {
+            self.fps = self.frame_count;
+            self.frame_count = 0;
+            self.last_capture = time;
+        } else {
+            self.frame_count += 1;
+        }
+        draw_number(state.canvas_size.0 - 8.0, 8.0, self.fps as usize, Alignment::Right, state, ctx)?;
+        Ok(())
+    }
+}
+
 #[derive(PartialEq, Eq, Copy, Clone)]
 pub enum Season {
     None,
@@ -274,6 +299,7 @@ impl SharedGameState {
                 }
             }
             ScanCode::F10 => self.settings.debug_outlines = !self.settings.debug_outlines,
+            ScanCode::F11 => self.settings.fps_counter = !self.settings.fps_counter,
             ScanCode::F12 => self.debugger = !self.debugger,
             _ => {}
         }