Make breath meter deplete in space

README.md

@@ -27,12 +27,12 @@ A WIP space mod for Fabric 1.20.1 with 6DOF movement.
 - [x] look around
   - [ ] fix third person front view rotation controls
 - [x] controls for roll
-- [ ] camera relative movement (hook Entity.movementInputToVelocity)
+- [x] camera relative movement
 - [ ] sync orientation
 - [x] animate transition back to upright (roll)
 
 ## Air
-- [ ] make breath meter deplete in space
+- [x] make breath meter deplete in space
 - [ ] oxygen tanks
 - [ ] pressurization system
   - [ ] airlocks

src/main/java/gdavid/sixdoftest/mixin/LivingEntityMixin.java

@@ -2,10 +2,12 @@
 
 import gdavid.sixdoftest.SpaceManager;
 import net.minecraft.entity.LivingEntity;
+import net.minecraft.registry.tag.FluidTags;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Unique;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
 
 @Mixin(LivingEntity.class)
@@ -21,5 +23,21 @@ private void noFallDamageIn6DOFSpace(float fallDistance, float damageMultiplier,
         if (!SpaceManager.isIn6dof(self())) return;
         callback.setReturnValue(0);
     }
+
+    @Inject(method = "getNextAirOnLand", at = @At("HEAD"), cancellable = true)
+    private void noAirInSpace(int air, CallbackInfoReturnable<Integer> callback) {
+        if (!SpaceManager.isIn6dof(self())) return;
+        callback.setReturnValue(air); // Prevent refilling air
+    }
+
+    @Inject(method = "baseTick", at = @At("HEAD"))
+    private void depleteAirInSpace(CallbackInfo callback) {
+        if (!SpaceManager.isIn6dof(self()) || self().isSubmergedIn(FluidTags.WATER)) return;
+        self().setAir(self().getAir() - 1);
+        if (self().getAir() == -20) {
+            self().setAir(0);
+            self().damage(self().getDamageSources().drown(), 2.0F);
+        }
+    }
 
 }