From 6e2d96a17b3d6773419885525cb5f9b58cdd4fed Mon Sep 17 00:00:00 2001
From: "Elijah C. Voigt" <elijah.caine.mv@gmail.com>
Date: Fri, 19 Apr 2024 21:52:12 -0700
Subject: [PATCH] audio intensity

---
 assets/martian.tweak.toml |  2 ++
 src/audio.rs              | 33 +++++++++++++++++++++++++++++++++
 src/game.rs               |  1 -
 3 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/assets/martian.tweak.toml b/assets/martian.tweak.toml
index e5792d5..608fc81 100644
--- a/assets/martian.tweak.toml
+++ b/assets/martian.tweak.toml
@@ -130,6 +130,8 @@ font = "fonts/Neothic/Neothic.ttf"
 ###
 [audio.music]
 main = "/Music/Main Track2"
+intensity_min = 0.0
+intensity_max = 400.0
 
 ###
 # Menu SFX
diff --git a/src/audio.rs b/src/audio.rs
index 5088256..9349853 100644
--- a/src/audio.rs
+++ b/src/audio.rs
@@ -27,6 +27,7 @@ impl Plugin for AudioPlugin {
                 audio_trigger.run_if(on_event::<AudioEvent>()),
                 control_volume.run_if(resource_changed::<AudioVolume>),
                 toggle_volume.run_if(just_pressed(KeyCode::KeyM)),
+                set_intensity.run_if(in_state(GameState::Play).and_then(resource_exists::<tweak::GameTweaks>.and_then(resource_changed::<game::Board>))),
             ),
         );
     }
@@ -145,3 +146,35 @@ fn toggle_volume(mut vol: ResMut<AudioVolume>) {
 fn control_volume(vol: Res<AudioVolume>, query: Query<&AudioSource>) {
     query.iter().for_each(|aud_src| aud_src.set_volume(vol.0));
 }
+
+fn set_intensity(
+    mut query: Query<(&mut AudioSource, &AudioEvent)>,
+    board: Res<game::Board>,
+    tweaks_file: Res<tweak::GameTweaks>,
+    tweaks: Res<Assets<Tweaks>>,
+) {
+    let tweak = tweaks
+        .get(tweaks_file.handle.clone())
+        .expect("Load tweakfile");
+    let value = {
+        let intensity_min = tweak.get::<f32>("audio_music_intensity_min").unwrap();
+        let intensity_max = tweak.get::<f32>("audio_music_intensity_max").unwrap();
+        let intensity_range = intensity_max - intensity_min;
+
+        let count_side_a = board.on(Side::A).len();
+        let count_side_b = board.on(Side::B).len();
+        let min_side = count_side_a.min(count_side_b);
+        let max_side_size = 16;
+
+        let intensity_ratio = ((max_side_size as f32) - (min_side as f32)) / (max_side_size as f32);
+
+        (intensity_ratio * intensity_range) + intensity_min
+    };
+
+    query.iter_mut()
+        .filter(|(_, event)| **event == AudioEvent::MainMusic)
+        .for_each(|(mut source, _)| {
+            info!("Setting music intensity to {:?}", value);
+            source.event_instance.set_parameter_by_name("Intensity", value, true).expect("Set intensity parameter");
+        });
+}
\ No newline at end of file
diff --git a/src/game.rs b/src/game.rs
index ea587f2..01d69f7 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -377,7 +377,6 @@ impl Board {
     }
 
     /// Show all pieces on one side of the board
-    /// OPTIMIZE: This is only used to tell if a side is empty, so it is more work than we need to do.
     pub(crate) fn on(&self, side: Side) -> Vec<(&Piece, BoardIndex)> {
         match side {
             Side::A => {