implement suit integrity and oxygen drain

src/actor.rs

@@ -103,6 +103,7 @@ pub struct Suit {
     pub power: f32,
     pub oxygen_max: f32,
     pub power_max: f32,
+    pub integrity: f32, // [0.0 - 1.0]
 }
 impl Default for Suit { fn default() -> Self { SUIT_SIMPLE } }
 
@@ -111,6 +112,7 @@ const SUIT_SIMPLE: Suit = Suit {
     power_max: 1e5,
     oxygen: nature::OXY_D,
     oxygen_max: nature::OXY_D,
+    integrity: 1e5,
 };
 
 pub fn update_physics_actors(
@@ -139,7 +141,27 @@ pub fn update_physics_lifeforms(
             lifeform.adrenaline_jolt = 0.0
         }
         lifeform.adrenaline = (lifeform.adrenaline - 0.0001 + lifeform.adrenaline_jolt * 0.01).clamp(0.0, 1.0);
-        suit.oxygen = (suit.oxygen - nature::OXY_S*d).clamp(0.0, 1.0);
+
+        let mut oxygen_drain = nature::OXY_S;
+        let integr_threshold = 0.5;
+        if suit.integrity < integr_threshold {
+            // The oxygen drain from suit integrity scales with (2 - 2x)^4,
+            // which is a function with ~16 at x=0 and 0 at x=1.
+            // Furthermore, x is divided by the integrity threshold (e.g. 0.5)
+            // to squeeze the function horizontally, and change the range for
+            // the x parameter from [0-1] to [0-integritythreshold]
+            //
+            // 16 |.
+            //    |.
+            //    |'.
+            //    | '.
+            //    |   '..
+            //    |______''....
+            //    x=0         x=1
+            let drain_scaling = (2.0 - 2.0 * suit.integrity / integr_threshold).powf(4.0);
+            oxygen_drain += suit.oxygen * 0.01 * drain_scaling;
+        }
+        suit.oxygen = (suit.oxygen - oxygen_drain*d).clamp(0.0, suit.oxygen_max);
     }
 }
 

src/hud.rs

@@ -218,6 +218,24 @@ fn setup(
                 ..default()
             }
         ),
+        TextSection::new(
+            "\nSuit Integrity ",
+            TextStyle {
+                font: asset_server.load(FONT),
+                font_size: settings.font_size_hud,
+                color: Color::GRAY,
+                ..default()
+            },
+        ),
+        TextSection::new(
+            "",
+            TextStyle {
+                font: asset_server.load(FONT),
+                font_size: settings.font_size_hud,
+                color: Color::GRAY,
+                ..default()
+            }
+        ),
         TextSection::new(
             "\n\n",
             TextStyle {
@@ -344,6 +362,8 @@ fn update(
                 text.sections[7].value = format!("{adrenaline:.0}pg/mL");
                 let all_actors = query_all_actors.iter().len();
                 text.sections[10].value = format!("{all_actors:.0}");
+                let integrity = suit.integrity * 100.0;
+                text.sections[12].value = format!("{integrity:.0}%");
             }
         }
 

src/world.rs

@@ -80,7 +80,8 @@ pub fn setup(
         },
         actor::LifeForm::default(),
         actor::Suit {
-            oxygen: nature::OXY_M,
+            oxygen: nature::OXY_H,
+            integrity: 0.3,
             ..default()
         },
         Camera3dBundle {