Implement crouching

Reviewed-on: #61

src/fighter/animation.rs

@@ -84,6 +84,9 @@ pub enum AnimKind {
     AirDodge,
     Fall,
     Turn,
+    CrouchEnter,
+    CrouchIdle,
+    CrouchExit,
 
     FlinchGround,
     FlinchAir,

src/fighter/attack/mod.rs

@@ -605,7 +605,6 @@ impl Plugin for FighterAttackPlugin {
                 intersect_attacks_with_hurtboxes,
             )
                 .chain()
-                .after(crate::fighter::baked_animation::update_fighter_bone_matrices)
                 .in_set(GameplaySet::Attacks),
         );
     }

src/fighter/baked_animation/mod.rs

@@ -219,6 +219,7 @@ mod tests {
         second.translate(FGVec3::lit("0", "3", "0"));
         let mut matrices = FighterBoneMatrices::default();
         matrices.set_pose(
+            AnimKind::Wait,
             &["root".into(), "hand".into()],
             &[None, Some(0)],
             &[first, second],
@@ -239,6 +240,7 @@ mod tests {
         hand.translate(FGVec3::lit("0", "3", "0"));
         let mut matrices = FighterBoneMatrices::default();
         matrices.set_pose(
+            AnimKind::Wait,
             &["root".into(), "hand".into()],
             &[None, Some(0)],
             &[root, hand],
@@ -266,9 +268,9 @@ mod tests {
         let parents = [None, Some(0)];
         let pose = [FixedMat4::IDENTITY, FixedMat4::IDENTITY];
 
-        matrices.set_pose(&names, &parents, &pose, FGi32::ONE);
+        matrices.set_pose(AnimKind::Wait, &names, &parents, &pose, FGi32::ONE);
         let capacities = matrices.buffer_capacities();
-        matrices.set_pose(&names, &parents, &pose, FGi32::ONE);
+        matrices.set_pose(AnimKind::Wait, &names, &parents, &pose, FGi32::ONE);
 
         assert_eq!(capacities, matrices.buffer_capacities());
     }
@@ -281,6 +283,7 @@ mod tests {
         hand.translate(FGVec3::lit("0", "2", "0"));
         let mut matrices = FighterBoneMatrices::default();
         matrices.set_pose(
+            AnimKind::Wait,
             &["root".into(), "hand".into()],
             &[None, Some(0)],
             &[root, hand],

src/fighter/baked_animation/runtime.rs

@@ -71,6 +71,7 @@ pub struct FighterBoneMatrices {
     local_matrices: Vec<FixedMat4>,
     previous_local_matrices: Vec<FixedMat4>,
     model_matrices: Vec<Option<FixedMat4>>,
+    presentation_kind: Option<AnimKind>,
 }
 
 #[derive(Component, Clone, Debug, Default)]
@@ -138,6 +139,7 @@ impl FighterBoneMatrices {
     }
     pub(super) fn set_pose(
         &mut self,
+        kind: AnimKind,
         bone_names: &[String],
         parents: &[Option<usize>],
         local: &[FixedMat4],
@@ -166,6 +168,7 @@ impl FighterBoneMatrices {
         self.previous_local_matrices.reserve(local.len());
         self.model_matrices.reserve(local.len());
         std::mem::swap(&mut self.matrices, &mut self.previous_frame_matrices);
+        let animation_changed = self.presentation_kind != Some(kind);
         std::mem::swap(&mut self.local_matrices, &mut self.previous_local_matrices);
         self.local_matrices.clear();
         self.local_matrices.extend_from_slice(local);
@@ -189,6 +192,14 @@ impl FighterBoneMatrices {
                 model_scale.mul(matrix.expect("baked bone hierarchy should be valid"))
             }),
         );
+        // A state transition is a discontinuity, not an animation frame to
+        // interpolate from the previous clip.  Keep the presentation pose at
+        // the new clip's first/current frame immediately.
+        if animation_changed {
+            self.previous_local_matrices
+                .clone_from(&self.local_matrices);
+        }
+        self.presentation_kind = Some(kind);
     }
 }
 
@@ -218,6 +229,7 @@ pub fn update_fighter_bone_matrices(
             .get(&fighter.manifest)
             .expect("fighter manifest should be loaded before the match starts");
         matrices.set_pose(
+            frame.kind,
             &baked.bone_names,
             &baked.parents,
             pose,

src/fighter/debug.rs

@@ -27,6 +27,7 @@ use crate::game_settings::GameSettings;
 use crate::input::FighterInput;
 use crate::math::int::FGi32;
 use crate::math::vec::FGVec2;
+use crate::math::vec3::FGVec3;
 use crate::player::Player;
 
 pub fn debug_draw_ecb(
@@ -39,6 +40,12 @@ pub fn debug_draw_ecb(
     mut gizmos: Gizmos,
 ) {
     for (ecb, trf, ecb_prev, trf_prev) in ecbs {
+        gizmos.cross(
+            FGVec3::new(trf.0.x, trf.0.y, FGi32::ZERO).to_vec3(),
+            2.0,
+            bevy::color::palettes::css::BLUE,
+        );
+
         let transformed =
             ecb.to_3d_lineloop(Transform::from_xyz(trf.x.to_num(), trf.y.to_num(), 0.0));
         gizmos.lineloop(transformed, YELLOW);
@@ -153,7 +160,14 @@ pub fn fighter_debug(
     Ok(())
 }
 
-pub fn animation_debug(query: Query<(&FighterTranslation, &FighterFacingDirection, &FighterBoneMatrices)>, mut gizmos: Gizmos) {
+pub fn animation_debug(
+    query: Query<(
+        &FighterTranslation,
+        &FighterFacingDirection,
+        &FighterBoneMatrices,
+    )>,
+    mut gizmos: Gizmos,
+) {
     for (global_transform, facing_dir, matrices) in query {
         let global_transform = global_transform.get_3d_transform(facing_dir);
         let marker_transform = global_transform.to_mat4();

src/fighter/ecb.rs

@@ -80,13 +80,10 @@ pub fn update_ecb(
         &FighterTranslation,
         &FighterFacingDirection,
     )>,
-    mut gizmos: Gizmos
 ) {
     for (mut ecb, surface_state, bone_indices, bone_matrices, translation, facing_dir) in query {
         let trf = translation.get_3d_transform(facing_dir);
 
-        gizmos.cross(trf.get_translation().to_vec3(), 2.0, bevy::color::palettes::css::BLUE);
-
         let transformed_ecb_bones = bone_indices.indices.iter().filter_map(|idx| {
             let Some((_, bone_matrix)) = bone_matrices.get_by_idx(*idx) else {
                 return None;
@@ -114,8 +111,6 @@ pub fn update_ecb(
             0
         };
 
-        dbg!(ecb_lock_frames_remaining);
-
         ecb.top = top;
 
         if ecb_lock_frames_remaining == 0 {

src/fighter/mod.rs

@@ -171,10 +171,15 @@ impl Plugin for FighterPlugin {
             )*/
             .add_systems(
                 GgrsSchedule,
-                (ecb::update_ecb, state::state_collision_interrupt_system, ecb::decrement_ecb_lockout).chain().in_set(GameplaySet::Collision),
+                (
+                    (ecb::update_ecb, ecb::decrement_ecb_lockout, state::state_collision_interrupt_system).chain(),
+                    baked_animation::update_fighter_bone_matrices,
+                )
+                    .chain()
+                    .in_set(GameplaySet::Collision),
             )
             .add_systems(
-                Update,
+                PostUpdate,
                 (
                     motion::apply_fighter_translation_to_visuals,
                     animation::apply_animation,

src/fighter/state/crouch.rs

@@ -0,0 +1,126 @@
+use super::{
+    CollisionContext, EnterContext, FighterStateImpl, InterruptContext, UpdateContext, ground,
+};
+use crate::fighter::animation::AnimKind;
+use crate::fighter::state::{FighterState, dash, ground_attack, turn, walk};
+use crate::fighter::state::ground::{grounded_movement_common_interrupts, grounded_movement_standstill_common_interrupts};
+
+#[derive(Debug, Clone, Hash)]
+pub enum CrouchSubState {
+    Entering,
+    Idle,
+    Exiting
+}
+
+#[derive(Debug, Clone, Hash)]
+pub struct CrouchState {
+    sub_state: CrouchSubState
+}
+
+pub fn crouch_idle_interrupts(
+    state_context: &InterruptContext,
+) -> Option<FighterState> {
+    if let Some(state) = ground_attack::check_interrupt(state_context) {
+        Some(state)
+    } else if let Some(state) = dash::check_input(state_context) {
+        Some(state)
+    } else if let Some(state) = turn::check_input(state_context) {
+        Some(state)
+    } else if let Some(state) = walk::check_input(state_context) {
+        Some(state)
+    } else {
+        None
+    }
+}
+
+pub fn crouch_entering_interrupts(
+    state_context: &InterruptContext,
+) -> Option<FighterState> {
+    if let Some(state) = ground_attack::check_interrupt(state_context) {
+        Some(state)
+    } else {
+        None
+    }
+}
+
+impl FighterStateImpl for CrouchState {
+    const NAME: &'static str = "Crouch";
+    fn check_interrupt(&self, state_context: &mut InterruptContext) -> Option<FighterState> {
+        if let Some(state) = grounded_movement_common_interrupts(state_context) {
+            return Some(state);
+        }
+
+        match self.sub_state {
+            CrouchSubState::Entering => {
+                // While entering the crouch animation we do not allow movement inputs, but we do allow attacks and jumps
+                if state_context.is_current_animation_finished() {
+                    return Some(FighterState::Crouch(
+                        CrouchState {
+                            sub_state: CrouchSubState::Idle,
+                        }
+                    ));
+                } else {
+                    return crouch_entering_interrupts(state_context);
+                }
+            },
+            CrouchSubState::Idle => {
+                if state_context.input.get_last_frame().movement.y > -state_context.game_settings.input_common.run_stick_threshold {
+                    return Some(FighterState::Crouch (
+                        CrouchState {
+                            sub_state: CrouchSubState::Exiting,
+                        }
+                    ));
+                } else {
+                    return crouch_idle_interrupts(state_context);
+                }
+            },
+            CrouchSubState::Exiting => {
+                if state_context.is_current_animation_finished() {
+                    return grounded_movement_standstill_common_interrupts(state_context);
+                } else {
+                    return crouch_idle_interrupts(state_context);
+                }
+            },
+        }
+    }
+
+    fn on_enter(&mut self, state_context: &mut EnterContext) {
+        match self.sub_state {
+            CrouchSubState::Entering => {
+                state_context.play_animation(AnimKind::CrouchEnter, false);
+            },
+            CrouchSubState::Idle => {
+                state_context.play_animation(AnimKind::CrouchIdle, true);
+            },
+            CrouchSubState::Exiting => {
+                state_context.play_animation(AnimKind::CrouchExit, false);
+            },
+        }
+    }
+
+    fn update(&mut self, state_context: &mut UpdateContext) {
+        ground::update_friction_motion(state_context);
+    }
+
+    fn check_collision_interrupt(
+        &mut self,
+        state_context: &mut CollisionContext,
+    ) -> Option<FighterState> {
+        ground::collision_interrupt(state_context, false)
+    }
+
+    fn is_visually_grounded<'a>(&'a self) -> bool {
+        true
+    }
+}
+
+pub fn check_input(state_context: &InterruptContext) -> Option<FighterState> {
+    let input_frame = state_context.input.get_last_frame();
+
+    if input_frame.movement.y <= -state_context.game_settings.input_common.run_stick_threshold {
+        return Some(FighterState::Crouch(CrouchState {
+            sub_state: CrouchSubState::Entering
+        }));
+    }
+    None
+}

src/fighter/state/ground.rs

@@ -3,8 +3,7 @@
 //! bit-for-bit deterministic for rollback.
 
 use crate::fighter::state::{
-    CollisionContext, FighterState, InterruptContext, air, dash, fall, ground_attack, turn, wait,
-    walk,
+    CollisionContext, FighterState, InterruptContext, air, crouch, dash, fall, ground_attack, turn, wait, walk,
 };
 use crate::fighter::{
     FighterAttributes, FighterPreviousTranslation, FighterTranslation, FighterVelocity,
@@ -461,6 +460,8 @@ pub fn grounded_movement_standstill_common_interrupts(
         Some(state)
     } else if let Some(state) = turn::check_input(state_context) {
         Some(state)
+    } else if let Some(state) = crouch::check_input(state_context) {
+        Some(state)
     } else if let Some(state) = walk::check_input(state_context) {
         Some(state)
     } else if let Some(state) = wait::check_input(state_context) {

src/fighter/state/mod.rs

@@ -41,6 +41,7 @@ pub mod run;
 pub mod turn;
 pub mod wait;
 pub mod walk;
+pub mod crouch;
 
 #[derive(Clone, Copy, Debug, Hash, PartialEq, Eq)]
 pub enum SurfacePolicy {
@@ -211,6 +212,7 @@ impl CollisionContext<'_> {
 fighter_states! {
     Wait => wait::WaitState,
     Walk => walk::WalkState,
+    Crouch => crouch::CrouchState,
     Dash => dash::DashState,
     Run => run::RunState,
     Fall => fall::FallState,

src/schedule.rs

@@ -19,10 +19,10 @@ pub enum GameplaySet {
     StateUpdate,
     /// Integrate velocities into positions.
     Physics,
-    /// Solve collision boxes
-    Animation,
     /// Resolve the integrated positions against the stage.
     Collision,
+    /// Solve collision boxes
+    Animation,
     /// Resolve attacks
     Attacks,
 }
@@ -40,8 +40,8 @@ impl Plugin for GameplaySchedulePlugin {
                 GameplaySet::Interrupt,
                 GameplaySet::StateUpdate,
                 GameplaySet::Physics,
-                GameplaySet::Collision,
                 GameplaySet::Animation,
+                GameplaySet::Collision,
                 GameplaySet::Attacks,
             )
                 .chain(),