feat: add audio muting button, mute by default in debug builds

src/audio.rs

@@ -15,6 +15,7 @@ pub struct Audio {
     _mixer_context: mixer::Sdl2MixerContext,
     sounds: Vec<Chunk>,
     next_sound_index: usize,
+    muted: bool,
 }
 
 impl Audio {
@@ -51,6 +52,7 @@ impl Audio {
             _mixer_context: mixer_context,
             sounds,
             next_sound_index: 0,
+            muted: false,
         }
     }
 
@@ -68,4 +70,18 @@ impl Audio {
         }
         self.next_sound_index = (self.next_sound_index + 1) % self.sounds.len();
     }
+
+    /// Instantly mute or unmute all channels.
+    pub fn set_mute(&mut self, mute: bool) {
+        let channels = 4;
+        let volume = if mute { 0 } else { 32 };
+        for i in 0..channels {
+            mixer::Channel(i).set_volume(volume);
+        }
+        self.muted = mute;
+    }
+
+    pub fn is_muted(&self) -> bool {
+        self.muted
+    }
 }

src/game.rs

@@ -1,5 +1,6 @@
 //! This module contains the main game logic and state.
 use std::cell::RefCell;
+use std::ops::Not;
 use std::rc::Rc;
 
 use rand::seq::IteratorRandom;
@@ -37,7 +38,7 @@ pub struct Game<'a> {
     map: Rc<RefCell<Map>>,
     debug_mode: DebugMode,
     score: u32,
-    audio: Audio,
+    pub audio: Audio,
     blinky: Blinky<'a>,
     edibles: Vec<Edible<'a>>,
 }
@@ -107,18 +108,6 @@ impl<'a> Game<'a> {
             None,
         ));
 
-        // Load font from asset API
-        let font = {
-            let font_bytes = get_asset_bytes(Asset::FontKonami).expect("Failed to load asset").into_owned();
-            let font_bytes_static: &'static [u8] = Box::leak(font_bytes.into_boxed_slice());
-            let font_rwops = RWops::from_bytes(font_bytes_static).expect("Failed to create RWops for font");
-            ttf_context
-                .load_font_from_rwops(font_rwops, 24)
-                .expect("Could not load font from asset API")
-        };
-
-        let audio = Audio::new();
-
         // Load map texture from asset API
         let map_bytes = get_asset_bytes(Asset::Map).expect("Failed to load asset");
         let mut map_texture = texture_creator
@@ -133,6 +122,18 @@ impl<'a> Game<'a> {
             Rc::clone(&pellet_texture), // placeholder for fruit sprite
         );
 
+        // Load font from asset API
+        let font = {
+            let font_bytes = get_asset_bytes(Asset::FontKonami).expect("Failed to load asset").into_owned();
+            let font_bytes_static: &'static [u8] = Box::leak(font_bytes.into_boxed_slice());
+            let font_rwops = RWops::from_bytes(font_bytes_static).expect("Failed to create RWops for font");
+            ttf_context
+                .load_font_from_rwops(font_rwops, 24)
+                .expect("Could not load font from asset API")
+        };
+
+        let audio = Audio::new();
+
         Game {
             canvas,
             pacman,
@@ -173,6 +174,12 @@ impl<'a> Game<'a> {
             return;
         }
 
+        // Toggle mute
+        if keycode == Keycode::M {
+            self.audio.set_mute(self.audio.is_muted().not());
+            return;
+        }
+
         // Reset game
         if keycode == Keycode::R {
             self.reset();

src/main.rs

@@ -107,6 +107,7 @@ pub fn main() {
 
     let texture_creator = canvas.texture_creator();
     let mut game = Game::new(&mut canvas, &texture_creator, &ttf_context, &audio_subsystem);
+    game.audio.set_mute(cfg!(debug_assertions));
 
     let mut event_pump = sdl_context.event_pump().expect("Could not get SDL EventPump");