src/fighter/state/air.rs

@@ -129,6 +129,7 @@ pub fn collision_interrupt(
 ) -> Option<FighterState> {
     if ctx.velocity.y <= FGi32::ZERO {
         if let Some(ledge_result) = ctx.air_collide_with_ledges() {
+            ctx.apply_desired_ecb();
             return Some(FighterState::LedgeGrab(LedgeGrabState::new(ledge_result.ledge)));
         }
     }

src/fighter/state/air_dodge.rs

@@ -56,7 +56,7 @@ impl FighterStateImpl for AirDodgeState {
                     let point_in_segment = segment.segment.closest_point(bottom_point);
                     let dist_to_segment = point_in_segment.distance(bottom_point);
                     if dist_to_segment <= state_context.waveland_snap_distance {
-                        state_context.ecb.bottom = point_in_segment;
+                        state_context.ecb.bottom = point_in_segment - state_context.translation.0;
                         state_context.ecb.rebase_onto_bottom();
                         state_context.surface.land(StageLineID { polygon: poly_idx, segment: segment_idx }, state_context.ledge_info);
                         return Some(FighterState::Land(LandingState::create(LandingType::Special)));

src/fighter/state/angel.rs

@@ -43,8 +43,9 @@ impl FighterStateImpl for AngelState {
     
     fn check_collision_interrupt(
         &mut self,
-        _state_context: &mut super::CollisionContext,
+        state_context: &mut super::CollisionContext,
     ) -> Option<super::FighterState> {
+        state_context.apply_desired_ecb();
         None
     }
     

src/fighter/state/ground.rs

@@ -211,7 +211,6 @@ pub fn collide_with_stage_grounded(
                 crate::fighter::surface::EcbLockPolicy::StartOnDetach,
                 state_context.leave_ground_ecb_lock_duration,
             );
-            state_context.ecb_advanced = true;
             return GroundedMotionResult::InAir;
         };
         match resolve_grounded_position(
@@ -238,7 +237,6 @@ pub fn collide_with_stage_grounded(
                     crate::fighter::surface::EcbLockPolicy::StartOnDetach,
                     state_context.leave_ground_ecb_lock_duration,
                 );
-                state_context.ecb_advanced = true;
                 return GroundedMotionResult::InAir;
             }
         }
@@ -247,7 +245,6 @@ pub fn collide_with_stage_grounded(
     *state_context.ecb = current_ecb;
     state_context.translation.0 = current_position;
     state_context.surface.land(line_id, state_context.ledge_info);
-    state_context.ecb_advanced = true;
     GroundedMotionResult::InGround
 }
 
@@ -419,7 +416,7 @@ mod tests {
                 origin: FGVec2::ZERO,
                 end: FGVec2::ZERO,
             },
-            ecb_advanced: false,
+            waveland_snap_distance: FGi32::ZERO,
         };
 
         assert!(matches!(
@@ -484,7 +481,7 @@ mod tests {
                 origin: FGVec2::ZERO,
                 end: FGVec2::ZERO,
             },
-            ecb_advanced: false,
+            waveland_snap_distance: FGi32::ZERO,
         };
 
         assert!(matches!(

src/fighter/state/ledge_action.rs

@@ -144,8 +144,9 @@ impl FighterStateImpl for LedgeActionState {
 
     fn check_collision_interrupt(
         &mut self,
-        _state_context: &mut CollisionContext,
+        state_context: &mut CollisionContext,
     ) -> Option<FighterState> {
+        state_context.apply_desired_ecb();
         None
     }
 

src/fighter/state/ledge_wait.rs

@@ -102,8 +102,9 @@ impl FighterStateImpl for LedgeWaitState {
 
     fn check_collision_interrupt(
         &mut self,
-        _state_context: &mut CollisionContext,
+        state_context: &mut CollisionContext,
     ) -> Option<FighterState> {
+        state_context.apply_desired_ecb();
         None
     }
 

src/fighter/state/mod.rs

@@ -120,8 +120,9 @@ pub trait FighterStateImpl: Sized {
 
     fn check_collision_interrupt(
         &mut self,
-        _state_context: &mut CollisionContext,
+        state_context: &mut CollisionContext,
     ) -> Option<FighterState> {
+        state_context.apply_desired_ecb();
         None
     }
 
@@ -261,7 +262,6 @@ pub struct CollisionContext<'a> {
     pub fighter_ledge_collision_box: FGRect,
     pub downward_stick_threshold: FGi32,
     pub waveland_snap_distance: FGi32,
-    pub(crate) ecb_advanced: bool,
 }
 
 impl CollisionContext<'_> {
@@ -269,7 +269,6 @@ impl CollisionContext<'_> {
     /// substep resolver can later replace this with fractional steps.
     pub fn apply_desired_ecb(&mut self) {
         ecb::interpolate_ecb(self.ecb, *self.desired_ecb, FGi32::ONE);
-        self.ecb_advanced = true;
     }
 
     pub fn air_collide_with_stage(
@@ -279,7 +278,7 @@ impl CollisionContext<'_> {
         let ignored_polys = self.surface.ignored_polygon_ids();
         let ignore_soft_platforms = can_ignore_soft_platforms
             && self.input.get_last_frame().movement.y <= -self.downward_stick_threshold;
-        let result = crate::fighter::collision::air_collide_with_stage_substepped(
+        crate::fighter::collision::air_collide_with_stage_substepped(
             self.prev_translation,
             self.translation,
             self.velocity,
@@ -288,15 +287,7 @@ impl CollisionContext<'_> {
             self.stage_collision,
             &ignored_polys,
             ignore_soft_platforms,
-        );
+        )
-        self.ecb_advanced = true;
-        result
-    }
-
-    fn finish_ecb_frame(&mut self) {
-        if !self.ecb_advanced {
-            self.apply_desired_ecb();
-        }
     }
     pub fn air_collide_with_ledges(
         &self,
@@ -503,7 +494,6 @@ impl<'w, 's> FighterFrameQueryItem<'w, 's> {
                 .leave_ground_ecb_frame_lock_duration,
             downward_stick_threshold: game_settings.input_common.run_stick_threshold,
             fighter_ledge_collision_box,
-            ecb_advanced: false,
             waveland_snap_distance: game_settings.fighter_common.waveland_snap_distance,
         }
     }
@@ -799,13 +789,9 @@ pub fn state_collision_interrupt_system(
             continue;
         }
 
-        let new_state = {
+        let new_state = state.check_collision_interrupt(
-            let mut collision_context =
+            &mut frame.collision_context(&stage_collision, manifest, &game_settings),
-                frame.collision_context(&stage_collision, manifest, &game_settings);
+        );
-            let new_state = state.check_collision_interrupt(&mut collision_context);
-            collision_context.finish_ecb_frame();
-            new_state
-        };
         if let Some(new_state) = new_state {
             transition_state(
                 &mut state,
@@ -874,7 +860,7 @@ mod tests {
         };
         let previous_ecb = FighterPreviousECB::from(ecb);
         let mut presentation_snap = FighterPresentationSnap::default();
-        let mut context = CollisionContext {
+        let context = CollisionContext {
             translation: &mut translation,
             prev_translation: &previous_translation,
             input: &input,
@@ -892,7 +878,6 @@ mod tests {
                 end: FGVec2::lit("1", "-1"),
             },
             downward_stick_threshold: FGi32::ONE,
-            ecb_advanced: false,
             waveland_snap_distance: FGi32::ZERO,
         };
 
@@ -902,7 +887,5 @@ mod tests {
             context.air_collide_with_ledges().map(|result| result.ledge),
             Some(ledge_id)
         );
-        context.finish_ecb_frame();
-        assert_eq!(context.ecb.top, FGVec2::lit("0", "2"));
     }
 }