Initial work on proper character movement

Cargo.lock

@@ -479,6 +479,12 @@ dependencies = [
  "syn 2.0.119",
 ]
 
+[[package]]
+name = "az"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "be5eb007b7cacc6c660343e96f650fedf4b5a77512399eb952ca6642cf8d13f7"
+
 [[package]]
 name = "base64"
 version = "0.22.1"
@@ -2055,6 +2061,14 @@ dependencies = [
  "thread_local",
 ]
 
+[[package]]
+name = "bevy_wind_waker_shader"
+version = "0.6.0"
+source = "git+https://github.com/lavaeater/bevy_wind_waker_shader.git#1b017c3ef6a4fbdaff115df9ec5ae4954b2fb6ba"
+dependencies = [
+ "bevy",
+]
+
 [[package]]
 name = "bevy_window"
 version = "0.19.0"
@@ -3211,6 +3225,18 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5baebc0774151f905a1a2cc41989300b1e6fbb29aff0ceffa1064fdd3088d582"
 
+[[package]]
+name = "fixed"
+version = "1.31.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9af2cbf772fa6d1c11358f92ef554cb6b386201210bcf0e91fb7fba8a907fb40"
+dependencies = [
+ "az",
+ "bytemuck",
+ "half",
+ "typenum",
+]
+
 [[package]]
 name = "fixedbitset"
 version = "0.5.7"
@@ -3405,8 +3431,10 @@ dependencies = [
  "bevy-inspector-egui",
  "bevy_egui",
  "bevy_ggrs",
+ "bevy_wind_waker_shader",
  "bitfields",
  "clap",
+ "fixed",
  "jackdaw_runtime",
  "serde",
 ]

Cargo.toml

@@ -28,6 +28,8 @@ bevy_ggrs = { git = "https://github.com/gschup/bevy_ggrs" }
 serde = "1.0.229"
 bitfields = "3.0.0"
 clap = { version = "4.6.6", features = ["derive"] }
+bevy_wind_waker_shader = { git = "https://github.com/lavaeater/bevy_wind_waker_shader.git" }
+fixed = "1.31.0"
 
 # Enable a small amount of optimization in the dev profile.
 [profile.dev]

src/fighter/animation.rs

@@ -0,0 +1,48 @@
+use bevy::{mesh::skinning::SkinnedMesh, prelude::*};
+
+use crate::{fighter::{FighterECB, FighterTranslation, FighterVisual}, player::Player};
+
+#[derive(Component)]
+pub struct FighterAnimations {
+    pub wait: Handle<AnimationClip>
+}
+
+#[derive(Component)]
+pub struct FighterAnimationPlayerLink(Entity);
+
+pub fn apply_fighter_translation_to_visuals(query: Query<(&FighterTranslation, &FighterECB, &mut Transform)>) {
+    for (translation, ecb, mut transform) in query {
+        let translation = translation.0 + ecb.get_bottom_point();
+        transform.translation = Vec3::new(translation.x, translation.y, 0.0);
+    }
+}
+
+pub fn setup_fighter_animation_player(
+    mut commands: Commands,
+    animated: Query<Entity, Added<AnimationPlayer>>,
+    parents: Query<&ChildOf>,
+    fighters: Query<Entity, With<Player>>,
+) {
+    for child in &animated {
+        let Some(parent) = parents
+            .iter_ancestors(child)
+            .filter_map(|parent| fighters.get(parent).ok())
+            .next()
+        else {
+            continue;
+        };
+        commands.entity(parent).insert(
+            FighterAnimationPlayerLink(child)
+        );
+    }
+}
+
+pub fn apply_animation(
+    children: Query<&mut Transform, With<FighterVisual>>,
+) {
+    for mut trf in children {
+        // Melee model scale is in decimeters
+        trf.scale = Vec3::splat(0.1);
+    }
+
+}

src/fighter/attributes.rs

@@ -17,7 +17,11 @@ pub struct FighterAttributes {
     pub stick_dash_accel: f32,
     pub max_dash_vel: f32,
 
+    pub jump_vertical_velocity: f32,
+
     pub ground_friction: f32,
+    pub terminal_velocity: f32,
+    pub gravity: f32,
 }
 
 impl FighterAttributes {

src/fighter/collision.rs

@@ -2,12 +2,15 @@
 
 use bevy::{color::palettes::css::HOT_PINK, prelude::*};
 
-use crate::fighter::{FighterECB, FighterTranslation, FighterVelocity};
-use crate::stage::StageLine;
-
+use crate::fighter::ecb::FighterPreviousECB;
+use crate::fighter::state::FighterStateContext;
+use crate::fighter::{FighterECB, FighterPreviousTranslation, FighterTranslation, FighterVelocity};
+use crate::stage::StagePoly;
+use crate::stage::line::{StageCollision, StageLineID};
+/*
 pub fn collide_fighter_with_scene(
     fighters: Query<(&FighterECB, &mut FighterVelocity, &mut FighterTranslation)>,
-    stage_planes: Query<&StageLine>,
+    stage_planes: Query<&StagePoly>,
     mut gizmos: Gizmos,
 ) {
     for (ecb, mut velocity, mut translation) in fighters {
@@ -29,3 +32,36 @@ pub fn collide_fighter_with_scene(
         }
     }
 }
+*/
+
+pub struct AirCollisionWithStageResult {
+    pub line_id: StageLineID,
+    pub hit_position: Vec2,
+    pub hit_normal: Vec2,
+}
+
+pub fn air_collide_with_stage(
+    state_context: &FighterStateContext,
+) -> Option<AirCollisionWithStageResult> {
+    let ray_segment = Segment2d::new(
+        state_context.prev_translation.0 + state_context.prev_ecb.get_bottom_point(),
+        state_context.translation.0 + state_context.ecb.get_bottom_point(),
+    );
+
+    for (poly_idx, poly) in state_context.stage_collision.stage_polys.iter().enumerate() {
+        if let Some(intersect_result) = poly.intersect_ray(ray_segment) {
+            return Some(AirCollisionWithStageResult {
+                line_id: {
+                    StageLineID {
+                        polygon: poly_idx,
+                        segment: intersect_result.segment_idx,
+                    }
+                },
+                hit_position: intersect_result.position,
+                hit_normal: intersect_result.normal,
+            });
+        }
+    }
+
+    None
+}

src/fighter/debug.rs

@@ -28,3 +28,16 @@ pub fn fighter_debug(
 
     Ok(())
 }
+
+pub fn update_config(
+    mut config_store: ResMut<GizmoConfigStore>,
+    keyboard: Res<ButtonInput<KeyCode>>,
+    real_time: Res<Time<Real>>,
+    mut virtual_time: ResMut<Time<Virtual>>,
+) {
+    if keyboard.just_pressed(KeyCode::KeyT) {
+        for (_, config, _) in config_store.iter_mut() {
+            config.depth_bias = if config.depth_bias == 0. { -1. } else { 0. };
+        }
+    }
+}

src/fighter/ecb.rs

@@ -4,12 +4,18 @@ use bevy::prelude::*;
 /// the stage. Purely geometry — the collision response lives in
 /// [`super::collision`].
 #[derive(Component, Debug, Clone, Copy)]
-#[require(Transform)]
+#[require(FighterPreviousECB)]
 pub struct FighterECB {
     pub vertical_half: f32,
     pub horizontal_half: f32,
 }
 
+#[derive(Component, Debug, Clone, Copy, Default)]
+pub struct FighterPreviousECB {
+    pub vertical_half: f32,
+    pub horizontal_half: f32,
+}
+
 impl FighterECB {
     pub fn to_3d_lineloop(&self, trf: Transform) -> [Vec3; 4] {
         let rel_up = trf.transform_point(Vec3::new(0.0, self.vertical_half, 0.0));
@@ -18,4 +24,22 @@ impl FighterECB {
         let rel_right = trf.transform_point(Vec3::new(self.horizontal_half, 0.0, 0.0));
         [rel_up, rel_right, rel_down, rel_left]
     }
+
+    pub fn get_bottom_point(&self) -> Vec2 {
+        Vec2::new(0.0, -self.vertical_half)
+    }
+}
+
+impl FighterPreviousECB {
+    pub fn to_3d_lineloop(&self, trf: Transform) -> [Vec3; 4] {
+        let rel_up = trf.transform_point(Vec3::new(0.0, self.vertical_half, 0.0));
+        let rel_down = trf.transform_point(Vec3::new(0.0, -self.vertical_half, 0.0));
+        let rel_left = trf.transform_point(Vec3::new(-self.horizontal_half, 0.0, 0.0));
+        let rel_right = trf.transform_point(Vec3::new(self.horizontal_half, 0.0, 0.0));
+        [rel_up, rel_right, rel_down, rel_left]
+    }
+
+    pub fn get_bottom_point(&self) -> Vec2 {
+        Vec2::new(0.0, -self.vertical_half)
+    }
 }

src/fighter/mod.rs

@@ -5,6 +5,7 @@ use bevy::prelude::*;
 use bevy_egui::EguiPrimaryContextPass;
 use bevy_ggrs::prelude::*;
 
+pub mod animation;
 pub mod attributes;
 pub mod collision;
 pub mod debug;
@@ -20,7 +21,7 @@ pub use attributes::FighterAttributes;
 pub use ecb::FighterECB;
 pub use motion::{FighterPreviousTranslation, FighterTranslation, FighterVelocity, Grounded};
 
-use crate::schedule::GameplaySet;
+use crate::{fighter::state::FighterState, schedule::GameplaySet, stage::line::StageCollision};
 use state::state_interrupt_system;
 
 /// Owns fighter simulation, the rollback registrations for fighter
@@ -28,43 +29,47 @@ use state::state_interrupt_system;
 #[derive(Default)]
 pub struct FighterPlugin;
 
+#[derive(Component, Copy, Clone, Hash)]
+pub enum FighterFacingDirection {
+    Left,
+    Right
+}
+
+#[derive(Component)]
+#[require(Transform)]
+pub struct FighterVisual;
+
 impl Plugin for FighterPlugin {
     fn build(&self, app: &mut App) {
         app
             // Every state gets a chance to interrupt itself, in priority order.
             .add_systems(
                 GgrsSchedule,
-                (
-                    state_interrupt_system::<state::wait::WaitState>,
-                    state_interrupt_system::<state::walk::WalkState>,
-                    state_interrupt_system::<state::dash::DashState>,
-                    state_interrupt_system::<state::run::RunState>,
-                )
-                    .chain()
-                    .in_set(GameplaySet::Interrupt),
+                (animation::setup_fighter_animation_player, state::state_interrupt_system,).in_set(GameplaySet::Interrupt),
             )
             .add_systems(
                 GgrsSchedule,
-                (
-                    state::wait::wait_update,
-                    state::walk::walk_update,
-                    state::dash::dash_update,
-                    state::run::run_update,
+                (state::state_update_system,).in_set(GameplaySet::StateUpdate),
             )
-                    .chain()
-                    .in_set(GameplaySet::StateUpdate),
-            )
-            .add_systems(
+            /*.add_systems(
                 GgrsSchedule,
-                (motion::integrate_gravity, motion::apply_motion)
+                (motion::integrate_gravity, motion::apply_grounded_motion)
                     .chain()
                     .in_set(GameplaySet::Physics),
+            )*/
+            .add_systems(
+                GgrsSchedule,
+                state::state_collision_interrupt_system.in_set(GameplaySet::Collision),
             )
             .add_systems(
                 GgrsSchedule,
-                collision::collide_fighter_with_scene.in_set(GameplaySet::Collision),
+                (
+                    animation::apply_fighter_translation_to_visuals,
+                    animation::apply_animation,
+                )
+                    .chain()
+                    .in_set(GameplaySet::Animation),
             )
-            .add_observer(state::dash::on_insert_dash)
             // Rollback registration lives next to the systems that write these
             // components; a component simulated here but missing from this list
             // is a desync waiting to happen.
@@ -74,13 +79,12 @@ impl Plugin for FighterPlugin {
             .rollback_component_with_copy::<FighterPreviousTranslation>()
             .rollback_component_with_copy::<FighterAttributes>()
             .rollback_component_with_copy::<Grounded>()
-            .rollback_component_with_copy::<state::wait::WaitState>()
-            .rollback_component_with_copy::<state::walk::WalkState>()
-            .rollback_component_with_copy::<state::dash::DashState>()
-            .rollback_component_with_copy::<state::run::RunState>()
-            .checksum_component::<state::dash::DashState>(state::dash::hash_dash_state)
+            .rollback_resource_with_reflect::<StageCollision>()
             // Debug views.
             .add_systems(FixedPostUpdate, debug::debug_draw_ecb)
-            .add_systems(EguiPrimaryContextPass, debug::fighter_debug);
+            .add_systems(EguiPrimaryContextPass, debug::fighter_debug)
+            .add_systems(EguiPrimaryContextPass, debug::update_config)
+            .rollback_component_with_clone::<FighterState>()
+            .checksum_component_with_hash::<FighterState>();
     }
 }

src/fighter/motion.rs

@@ -3,6 +3,8 @@
 
 use bevy::prelude::*;
 
+use crate::fighter::FighterAttributes;
+
 #[derive(Component, Clone, Copy)]
 pub struct Grounded;
 
@@ -16,20 +18,27 @@ pub struct FighterPreviousTranslation(pub Vec2);
 #[require(FighterPreviousTranslation)]
 pub struct FighterTranslation(pub Vec2);
 
-pub fn integrate_gravity(_fighters: Query<&mut FighterVelocity>, _time: Res<Time<Fixed>>) {}
-
-pub fn apply_motion(
+pub fn apply_air_motion(
     fighters: Query<(
         &FighterVelocity,
         &mut FighterTranslation,
         &mut FighterPreviousTranslation,
+        &mut Transform,
     )>,
     _time: Res<Time<Fixed>>,
 ) {
-    for (velocity, mut translation, mut prev_translation) in fighters {
+    for (velocity, mut translation, mut prev_translation, mut transform) in fighters {
         prev_translation.0 = translation.0;
         translation.0 += velocity.0;
     }
 }
 
+pub fn copy_fighter_transform_to_visuals(
+    fighters: Query<(&FighterTranslation, &mut Transform)>,
+) {
+    for (translation, mut transform) in fighters {
+        transform.translation = Vec3::new(translation.x, translation.y, 0.0);
+    }
+}
+
 pub fn fighter_movement() {}

src/fighter/state/air.rs

@@ -0,0 +1,18 @@
+use bevy::prelude::*;
+
+use crate::fighter::{*};
+
+pub fn integrate_gravity(velocity: &mut FighterVelocity, attributes: &FighterAttributes) {
+    velocity.y -= attributes.gravity;
+    velocity.y = velocity.y.max(-attributes.terminal_velocity);
+}
+
+pub fn apply_air_motion(
+    velocity: &FighterVelocity,
+    translation: &mut FighterTranslation,
+    prev_translation: &mut FighterPreviousTranslation,
+) {
+    // Vertical velocity should be 0 on the ground
+    prev_translation.0 = translation.0;
+    translation.0 += velocity.0;
+}

src/fighter/state/dash.rs

@@ -2,58 +2,100 @@ use std::hash::{Hash, Hasher};
 
 use bevy::prelude::*;
 
-use super::{FighterState, FighterStateContext, FighterStateTransition, ground, run, wait, walk};
-use crate::fighter::{FighterAttributes, FighterVelocity};
+use super::{FighterStateImpl, FighterStateContext, FighterStateTransition, ground, run, wait, walk};
+use crate::fighter::state::ground::GroundedStateCommon;
+use crate::fighter::state::wait::WaitState;
+use crate::fighter::state::{FighterState};
+use crate::fighter::{FighterAttributes, FighterVelocity, collision};
 use crate::game_settings::GameSettings;
 use crate::input::{
     FighterCommands::{SmashMoveLeft, SmashMoveRight},
     FighterInput,
 };
 
-pub struct DashStateCreator {}
-
-#[derive(Component, Debug, Clone, Copy)]
+#[derive(Debug, Clone)]
 pub struct DashState {
     frames_in_dash: u32,
     direction: f32,
+    ground_common: GroundedStateCommon
 }
 
-pub fn hash_dash_state(dash_state: &DashState) -> u64 {
-    let mut hasher = bevy_ggrs::checksum_hasher();
-    dash_state.direction.to_bits().hash(&mut hasher);
-    dash_state.frames_in_dash.hash(&mut hasher);
-    hasher.finish()
+impl std::hash::Hash for DashState {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.direction.to_bits().hash(state);
+        self.frames_in_dash.hash(state);
+    }
 }
 
 impl DashState {
-    pub fn new(direction: f32) -> Self {
+    pub fn new(direction: f32, ground_common: GroundedStateCommon) -> Self {
         Self {
             frames_in_dash: 0,
             direction,
+            ground_common
         }
     }
 }
 
-impl FighterState for DashState {
+impl FighterStateImpl for DashState {
+    const NAME: &'static str = "Dash";
     fn check_interrupt(
         &self,
         state_context: &FighterStateContext,
-    ) -> Option<FighterStateTransition> {
+    ) -> Option<FighterState> {
         if self.frames_in_dash > state_context.fighter_attribs.dash_duration {
             // Dash finish shenanigans
-            run::check_input(state_context)
-                .or_else(|| walk::check_input(state_context))
-                .or_else(|| wait::check_input(state_context))
+            run::check_input(state_context, &self.ground_common)
+                .or_else(|| walk::check_input(state_context, &self.ground_common))
+                .or_else(|| wait::check_input(state_context, &self.ground_common))
         } else {
             check_smash_input_with_dir(state_context)
                 .filter(|dir| *dir != self.direction)
-                .and_then(|dir| Some(FighterStateTransition::Dash(dir)))
-        }
+                .and_then(|dir| Some(FighterState::Dash(DashState::new(dir, self.ground_common.clone()))))
         }
     }
     
-pub fn start(state_context: &mut FighterStateContext) {
+    fn on_enter(&mut self, state_context: &mut FighterStateContext) {
         state_context.input.clear_buffer();
+        state_context.velocity.x = state_context.fighter_attribs.dash_initial_velocity * self.direction;
+    }
+    
+    fn update(&mut self, state_context: &mut FighterStateContext) {
+        self.frames_in_dash += 1;
+
+        let last_frame = state_context.input.get_last_frame();
+        let (accel, target_vel) = state_context.fighter_attribs.get_accel_and_target_dashrun(&last_frame);
+        let accel = ground::compute_ground_accel(
+            accel,
+            target_vel,
+            state_context.velocity.x,
+            state_context.fighter_attribs,
+            state_context.game_settings,
+        );
+        state_context.velocity.x += accel;
+
+        ground::apply_grounded_motion(
+            state_context.velocity,
+            state_context.translation,
+            state_context.prev_translation,
+        );
+    }
+
+    fn check_collision_interrupt(
+        &mut self,
+        state_context: &mut FighterStateContext,
+    ) -> Option<FighterState> {
+        if let Some(res) = collision::air_collide_with_stage(state_context) {
+            // Adjust translation
+            state_context.translation.0 = res.hit_position - state_context.ecb.get_bottom_point();
+            let grounded_common = GroundedStateCommon {
+                current_line_id: res.line_id
+            };
+            Some(FighterState::Wait(WaitState { grounded_common } ))
+        } else {
+            None
+        }
+    }
 }
 
 fn check_smash_input_with_dir(state_context: &FighterStateContext) -> Option<f32> {
@@ -66,51 +108,7 @@ fn check_smash_input_with_dir(state_context: &FighterStateContext) -> Option<f32
     }
 }
 
-pub fn check_input(state_context: &FighterStateContext) -> Option<FighterStateTransition> {
-    check_smash_input_with_dir(state_context).map(|dir| FighterStateTransition::Dash(dir))
-}
-
-pub fn dash_update(
-    dash_query: Query<(
-        &mut DashState,
-        &FighterAttributes,
-        &FighterInput,
-        &mut FighterVelocity,
-    )>,
-    game_settings: Res<GameSettings>,
-) {
-    for (mut dash, attributes, input, mut velocity) in dash_query {
-        dash.frames_in_dash += 1;
-
-        let last_frame = input.get_last_frame();
-        let (accel, target_vel) = attributes.get_accel_and_target_dashrun(&last_frame);
-        let accel = ground::compute_ground_accel(
-            accel,
-            target_vel,
-            velocity.x,
-            attributes,
-            game_settings.as_ref(),
-        );
-        velocity.x += accel;
-    }
-}
-
-pub fn on_insert_dash(
-    add: On<Insert, DashState>,
-    query: Query<
-        (
-            Entity,
-            &mut FighterInput,
-            &FighterAttributes,
-            &mut FighterVelocity,
-        ),
-        With<DashState>,
-    >,
-) {
-    for (entity, mut input, attribs, mut velocity) in query {
-        if entity == add.entity {
-            velocity.x = attribs.dash_initial_velocity * input.get_last_frame().movement.x.signum();
-            input.clear_buffer();
-        }
-    }
+pub fn check_input(state_context: &FighterStateContext, ground_common: &GroundedStateCommon) -> Option<FighterState> {
+    check_smash_input_with_dir(state_context).map(|dir| FighterState::Dash(DashState::new(dir, ground_common.clone())));
+    None
 }

src/fighter/state/fall.rs

@@ -0,0 +1,55 @@
+use bevy::prelude::*;
+
+use super::{FighterStateImpl, FighterStateContext, FighterStateTransition, ground, walk};
+use crate::fighter::state::{FighterState, air};
+use crate::fighter::state::ground::GroundedStateCommon;
+use crate::fighter::state::wait::WaitState;
+use crate::fighter::{FighterAttributes, FighterVelocity, collision, motion};
+use crate::game_settings::GameSettings;
+use crate::stage::line::StageCollision;
+
+#[derive(Debug, Clone, Copy, Hash)]
+pub struct FallState;
+
+impl FighterStateImpl for FallState {
+    const NAME: &'static str = "Fall";
+    fn check_interrupt(
+        &self,
+        state_context: &FighterStateContext,
+    ) -> Option<FighterState> {
+        None
+    }
+    
+    fn on_enter(&mut self, _state_context: &mut super::FighterStateContext) {}
+    
+    fn update(&mut self, state_context: &mut super::FighterStateContext) {
+        air::integrate_gravity(state_context.velocity, state_context.fighter_attribs);
+        air::apply_air_motion(state_context.velocity, state_context.translation, state_context.prev_translation);
+    }
+
+    fn check_collision_interrupt(
+        &mut self,
+        state_context: &mut FighterStateContext,
+    ) -> Option<FighterState> {
+        if let Some(res) = collision::air_collide_with_stage(state_context) {
+            // Adjust translation
+            state_context.translation.0 = res.hit_position - state_context.ecb.get_bottom_point();
+            let grounded_common = GroundedStateCommon {
+                current_line_id: res.line_id
+            };
+            Some(FighterState::Wait(WaitState { grounded_common } ))
+        } else {
+            None
+        }
+    }
+}
+
+pub fn check_input(state_context: &FighterStateContext) -> Option<FighterState> {
+    let input_frame = state_context.input.get_last_frame();
+
+    if input_frame.movement.x.abs() < state_context.game_settings.input_common.stick_deadzone {
+        return Some(FighterState::Fall(FallState));
+    }
+    None
+}
+

src/fighter/state/ground.rs

@@ -2,8 +2,20 @@
 //! ECS types so it stays cheap to reason about and to unit-test — it has to be
 //! bit-for-bit deterministic for rollback.
 
-use crate::fighter::FighterAttributes;
+use crate::fighter::state::FighterStateContext;
+use crate::fighter::{
+    FighterAttributes, FighterECB, FighterPreviousTranslation, FighterTranslation, FighterVelocity,
+};
 use crate::game_settings::GameSettings;
+use crate::stage::StagePoly;
+use crate::stage::line::{StageCollision, StageLineID, StagePolyLineSegment, StagePolyLineSegmentType};
+
+use bevy::prelude::*;
+
+#[derive(Reflect, Hash, Clone, Debug)]
+pub struct GroundedStateCommon {
+    pub current_line_id: StageLineID,
+}
 
 pub fn apply_grounded_friction(friction: f32, ground_vel: f32) -> f32 {
     if friction.abs() > ground_vel.abs() {
@@ -53,3 +65,79 @@ pub fn compute_ground_accel(
         accel
     }
 }
+
+pub enum GroundedMotionResult {
+    InGround,
+    InAir,
+}
+
+pub fn apply_grounded_motion(
+    velocity: &FighterVelocity,
+    translation: &mut FighterTranslation,
+    prev_translation: &mut FighterPreviousTranslation,
+) {
+    // Vertical velocity should be 0 on the ground
+    prev_translation.0 = translation.0;
+    translation.0 += Vec2::new(velocity.0.x ,0.0);
+}
+
+pub fn collide_with_stage_grounded(
+    state_context: &mut FighterStateContext,
+    ground_common: &mut GroundedStateCommon,
+    can_walk_off: bool
+) -> GroundedMotionResult {
+    let translation = &mut state_context.translation;
+    let ecb = &state_context.ecb;
+    let stage_collision = &state_context.stage_collision;
+
+    let stage_poly = stage_collision
+        .stage_polys
+        .get(ground_common.current_line_id.polygon);
+
+    if let Some(stage_poly) = stage_poly {
+        let ecb_bottom_pos = translation.0 + ecb.get_bottom_point();
+        let left_segment_idx = ground_common
+            .current_line_id
+            .segment
+            .checked_sub(1)
+            .unwrap_or(0);
+        let right_segment_idx =
+            (ground_common.current_line_id.segment + 1) % stage_poly.segments.len();
+
+        // First, we check the current segment, if that fails, we check the surrounding ones
+        let grounded_ecb_bottom_pos = [
+            ground_common.current_line_id.segment.clone(),
+            left_segment_idx,
+            right_segment_idx,
+        ]
+        .iter()
+        .find_map(|segment_idx| {
+            let segment = stage_poly.get_segment(*segment_idx)?;
+            if segment.segment_type != StagePolyLineSegmentType::Floor {
+                return None;
+            }
+
+            let line_dir = segment.segment.direction();
+            let projected_point = segment.segment.point1() + (ecb_bottom_pos - segment.segment.point1()).project_onto(line_dir.as_vec2());
+            let closest_point = segment.segment.closest_point(ecb_bottom_pos);
+            let distance = closest_point.distance(projected_point);
+            
+            if distance < 0.01 {
+                return Some((projected_point, *segment_idx, segment.normal));
+            }
+
+            None
+        });
+
+        if let Some((bp, new_segment_idx, normal)) = grounded_ecb_bottom_pos {
+            translation.0 = bp - ecb.get_bottom_point();
+            state_context.velocity.0 = state_context.velocity.0 - state_context.velocity.0.project_onto_normalized(normal);
+            ground_common.current_line_id.segment = new_segment_idx;
+            GroundedMotionResult::InGround
+        } else {
+            GroundedMotionResult::InAir
+        }
+    } else {
+        GroundedMotionResult::InAir
+    }
+}

src/fighter/state/jump.rs

@@ -0,0 +1,41 @@
+use bevy::prelude::*;
+
+use crate::fighter::state::{FighterState, FighterStateImpl};
+
+pub struct JumpState {
+    pub counter: u32
+}
+
+pub struct JumpSquatState {
+    pub counter: u32
+}
+
+
+impl FighterStateImpl for JumpSquatState {
+    const NAME: &'static str = "JumpSquat";
+    fn check_interrupt(
+        &self,
+        state_context: &super::FighterStateContext,
+    ) -> Option<FighterState> {
+        None
+    }
+
+    fn update(&mut self, _state_context: &mut super::FighterStateContext) {
+        todo!()
+    }
+    
+}
+
+impl FighterStateImpl for JumpState {
+    const NAME: &'static str = "Jump";
+    fn check_interrupt(
+        &self,
+        state_context: &super::FighterStateContext,
+    ) -> Option<FighterState> {
+        None
+    }
+
+    fn update(&mut self, _state_context: &mut super::FighterStateContext) {
+        todo!()
+    }
+}

src/fighter/state/mod.rs

@@ -2,65 +2,105 @@
 //! implements, the context they inspect, and the generic system that runs the
 //! interrupt check. One state per submodule.
 
+use bevy::ecs::component::Mutable;
+use bevy::ecs::system::ScheduleSystem;
 use bevy::prelude::*;
+use bevy_ggrs::{GgrsSchedule, RollbackApp};
 
-use crate::fighter::FighterAttributes;
+use crate::fighter::ecb::FighterPreviousECB;
+use crate::fighter::{FighterAttributes, FighterECB, FighterPreviousTranslation, FighterTranslation, FighterVelocity};
 use crate::game_settings::GameSettings;
 use crate::input::FighterInput;
+use crate::schedule::GameplaySet;
+use crate::stage::StagePoly;
+use crate::stage::line::StageCollision;
 
 pub mod dash;
 pub mod ground;
 pub mod run;
 pub mod wait;
 pub mod walk;
+pub mod fall;
+pub mod air;
+pub mod jump;
 
 pub enum FighterStateTransition {
     Wait,
     Walk,
     Dash(f32),
     Run,
+    Fall,
 }
 
-pub trait FighterState: Component + Sized {
-    fn remove(&self, state_context: &FighterStateContext, commands: &mut Commands) {
-        commands.entity(state_context.entity).remove::<Self>();
+macro_rules! fighter_states {
+    ($($variant:ident => $ty:ty),* $(,)?) => {
+        #[derive(Component, Clone, Debug, Hash)]
+        pub enum FighterState { $($variant($ty)),* }
+
+        impl FighterState {
+            pub fn name(&self) -> &'static str {
+                match self { $(Self::$variant(_) => <$ty>::NAME),* }
             }
-    fn check_interrupt(
-        &self,
-        state_context: &FighterStateContext,
-    ) -> Option<FighterStateTransition>;
+            pub fn check_interrupt(&self, ctx: &FighterStateContext) -> Option<FighterState> {
+                match self { $(Self::$variant(s) => s.check_interrupt(ctx)),* }
+            }
+            pub fn update(&mut self, ctx: &mut FighterStateContext) {
+                match self { $(Self::$variant(s) => s.update(ctx)),* }
+            }
+            pub fn on_enter(&mut self, ctx: &mut FighterStateContext) {
+                match self { $(Self::$variant(s) => s.on_enter(ctx)),* }
             }
 
-pub struct FighterStateContext<'a> {
-    pub input: &'a mut FighterInput,
-    pub fighter_attribs: &'a FighterAttributes,
-    pub game_settings: &'a GameSettings,
-    pub entity: Entity,
+            pub fn check_collision_interrupt(&mut self, ctx: &mut FighterStateContext) -> Option<FighterState> {
+                match self { $(Self::$variant(s) => s.check_collision_interrupt(ctx)),* }
+            }
         }
 
-fn create_state(
-    transition: FighterStateTransition,
-    state_context: FighterStateContext,
-    commands: &mut Commands,
-) {
-    let mut ent_cmd = commands.entity(state_context.entity);
-    match transition {
-        FighterStateTransition::Wait => ent_cmd.insert(wait::WaitState),
-        FighterStateTransition::Walk => ent_cmd.insert(walk::WalkState),
-        FighterStateTransition::Dash(dir) => ent_cmd.insert(dash::DashState::new(dir)),
-        FighterStateTransition::Run => ent_cmd.insert(run::RunState),
+        $(impl From<$ty> for FighterState {
+            fn from(s: $ty) -> Self { Self::$variant(s) }
+        })*
     };
 }
 
-fn get_state_debug_name(transition: &FighterStateTransition) -> &'static str {
-    match transition {
-        FighterStateTransition::Wait => "wait",
-        FighterStateTransition::Walk => "walk",
-        FighterStateTransition::Dash(_) => "dash",
-        FighterStateTransition::Run => "run",
+pub trait FighterStateImpl: Sized {
+    const NAME: &'static str;
+    fn check_interrupt(
+        &self,
+        state_context: &FighterStateContext,
+    ) -> Option<FighterState>;
+
+    fn on_enter(&mut self, _state_context: &mut FighterStateContext) {}
+    fn update(&mut self, _state_context: &mut FighterStateContext);
+
+    fn check_collision_interrupt(
+        &mut self,
+        _state_context: &mut FighterStateContext,
+    ) -> Option<FighterState> {
+        None
     }
 }
 
+pub struct FighterStateContext<'a> {
+    pub translation: &'a mut FighterTranslation,
+    pub prev_translation: &'a mut FighterPreviousTranslation,
+    pub input: &'a mut FighterInput,
+    pub velocity: &'a mut FighterVelocity,
+    pub ecb: &'a mut FighterECB,
+    pub prev_ecb: &'a mut FighterPreviousECB,
+    pub fighter_attribs: &'a FighterAttributes,
+    pub game_settings: &'a GameSettings,
+    pub entity: Entity,
+    pub stage_collision: &'a StageCollision,
+}
+
+fighter_states! {
+    Wait => wait::WaitState,
+    Walk => walk::WalkState,
+    Dash => dash::DashState,
+    Run => run::RunState,
+    Fall => fall::FallState
+}
+
 #[derive(Component)]
 pub struct StateNameDebug(pub &'static str);
 
@@ -70,25 +110,91 @@ impl std::fmt::Display for StateNameDebug {
     }
 }
 
-pub fn state_interrupt_system<T: FighterState + Component + std::fmt::Debug>(
-    query: Query<(Entity, &T, &mut FighterInput, &FighterAttributes)>,
+pub fn state_update_system(
+    query: Query<(Entity, &mut FighterState, &mut FighterTranslation, &mut FighterPreviousTranslation, &mut FighterInput, &mut FighterVelocity, &mut FighterECB, &mut FighterPreviousECB, &FighterAttributes)>,
+    stage_collision: Res<StageCollision>,
     game_settings: Res<GameSettings>,
-    mut commands: Commands,
+    mut gizmos: Gizmos,
 ) {
-    for (ent, state, mut input, attribs) in query {
-        let state_context = FighterStateContext {
+    for (ent, mut state, mut translation,  mut prev_translation, mut input, mut velocity, mut ecb, mut prev_ecb, attribs) in query {
+        let mut update_ctx = FighterStateContext {
+            translation: &mut translation,
+            prev_translation: &mut prev_translation,
             input: &mut input,
+            velocity: &mut velocity,
+            ecb: &mut ecb,
+            prev_ecb: &mut prev_ecb,
             fighter_attribs: &attribs,
             game_settings: &game_settings,
             entity: ent,
+            stage_collision: &stage_collision,
+        };
+        state.update(&mut update_ctx);
+    }
+}
+
+pub fn state_interrupt_system (
+    query: Query<(Entity, &FighterState, &mut FighterTranslation, &mut FighterPreviousTranslation, &mut FighterInput, &mut FighterVelocity, &mut FighterECB, &mut FighterPreviousECB, &FighterAttributes)>,
+    stage_collision: Res<StageCollision>,
+    game_settings: Res<GameSettings>,
+    mut commands: Commands,
+) {
+    for (ent, state, mut translation, mut prev_translation, mut input, mut velocity, mut ecb, mut prev_ecb, attribs) in query {
+        let mut state_context = FighterStateContext {
+            translation: &mut translation,
+            prev_translation: &mut prev_translation,
+            input: &mut input,
+            velocity: &mut velocity,
+            ecb: &mut ecb,
+            prev_ecb: &mut prev_ecb,
+            fighter_attribs: &attribs,
+            game_settings: &game_settings,
+            entity: ent,
+            stage_collision: &stage_collision
         };
         if let Some(new_state) = state.check_interrupt(&state_context) {
-            commands.entity(ent).remove::<T>();
-            info!("State {:?} -> {}", state, get_state_debug_name(&new_state));
-            commands
-                .entity(ent)
-                .insert(StateNameDebug(get_state_debug_name(&new_state)));
-            create_state(new_state, state_context, &mut commands);
+            let mut new_state = new_state;
+            let old_state_name = state.name();
+            let new_state_name = new_state.name();
+            new_state.on_enter(&mut state_context);
+            commands.entity(ent).insert((
+                new_state,
+                StateNameDebug(new_state_name)
+            ));
+            info!("State {} -> {}", old_state_name, new_state_name);
+        }
+    }
+}
+
+pub fn state_collision_interrupt_system(
+    query: Query<(Entity, &mut FighterState, &mut FighterTranslation, &mut FighterPreviousTranslation, &mut FighterInput, &mut FighterVelocity, &mut FighterECB, &mut FighterPreviousECB, &FighterAttributes)>,
+    stage_collision: Res<StageCollision>,
+    game_settings: Res<GameSettings>,
+    mut commands: Commands,
+) {
+    for (ent, mut state, mut translation, mut prev_translation, mut input, mut velocity, mut ecb, mut prev_ecb, attribs) in query {
+        let mut state_context = FighterStateContext {
+            translation: &mut translation,
+            prev_translation: &mut prev_translation,
+            input: &mut input,
+            velocity: &mut velocity,
+            ecb: &mut ecb,
+            prev_ecb: &mut prev_ecb,
+            fighter_attribs: &attribs,
+            game_settings: &game_settings,
+            entity: ent,
+            stage_collision: &stage_collision
+        };
+        if let Some(new_state) = state.check_collision_interrupt(&mut state_context) {
+            let mut new_state = new_state;
+            let old_state_name = state.name();
+            let new_state_name = new_state.name();
+            new_state.on_enter(&mut state_context);
+            commands.entity(ent).insert((
+                new_state,
+                StateNameDebug(new_state_name)
+            ));
+            info!("State {} -> {}", old_state_name, new_state_name);
         }
     }
 }

src/fighter/state/run.rs

@@ -1,49 +1,74 @@
 use bevy::prelude::*;
 
-use super::{FighterState, FighterStateContext, FighterStateTransition, ground, wait, walk};
+use super::{FighterStateImpl, FighterStateContext, FighterStateTransition, ground, wait, walk};
+use crate::fighter::state::FighterState;
+use crate::fighter::state::fall::FallState;
+use crate::fighter::state::ground::{GroundedMotionResult, GroundedStateCommon};
 use crate::fighter::{FighterAttributes, FighterVelocity};
 use crate::game_settings::GameSettings;
 use crate::input::FighterInput;
 
-#[derive(Component, Debug, Clone, Copy)]
-pub struct RunState;
+#[derive(Component, Debug, Clone, Hash)]
+pub struct RunState {
+    pub grounded_common: GroundedStateCommon
+}
 
-impl FighterState for RunState {
+impl FighterStateImpl for RunState {
+    const NAME: &'static str = "Run";
     fn check_interrupt(
         &self,
         state_context: &FighterStateContext,
-    ) -> Option<FighterStateTransition> {
-        if let Some(_) = check_input(state_context) {
+    ) -> Option<FighterState> {
+        let input_frame = state_context.input.get_last_frame();
+        if input_frame.movement.x.abs() >= state_context.game_settings.input_common.run_stick_threshold {
             None
         } else {
-            walk::check_input(state_context).or_else(|| wait::check_input(state_context))
-        }
+            walk::check_input(state_context, &self.grounded_common).or_else(|| wait::check_input(state_context, &self.grounded_common))
         }
     }
     
-pub fn check_input(state_context: &FighterStateContext) -> Option<FighterStateTransition> {
-    let input_frame = state_context.input.get_last_frame();
-    if input_frame.movement.x.abs() >= state_context.game_settings.input_common.run_stick_threshold
-    {
-        return Some(FighterStateTransition::Run);
-    }
-    None
-}
+    fn on_enter(&mut self, _state_context: &mut super::FighterStateContext) {}
     
-pub fn run_update(
-    fighters: Query<(&mut FighterVelocity, &FighterAttributes, &FighterInput), With<RunState>>,
-    game_settings: Res<GameSettings>,
-) {
-    for (mut velocity, attributes, input) in fighters {
-        let last_frame = input.get_last_frame();
-        let (accel, target_vel) = attributes.get_accel_and_target_dashrun(&last_frame);
+    fn update(&mut self, state_context: &mut super::FighterStateContext) {
+        let last_frame = state_context.input.get_last_frame();
+        let (accel, target_vel) = state_context.fighter_attribs.get_accel_and_target_dashrun(&last_frame);
         let accel = ground::compute_ground_accel(
             accel,
             target_vel,
-            velocity.x,
-            attributes,
-            game_settings.as_ref(),
+            state_context.velocity.x,
+            state_context.fighter_attribs,
+            state_context.game_settings,
         );
-        velocity.x += accel;
+        state_context.velocity.x += accel;
+
+        ground::apply_grounded_motion(
+            state_context.velocity,
+            state_context.translation,
+            state_context.prev_translation,
+        );
+    }
+
+    fn check_collision_interrupt(
+        &mut self,
+        state_context: &mut FighterStateContext,
+    ) -> Option<FighterState> {
+        if let GroundedMotionResult::InAir = ground::collide_with_stage_grounded(
+            state_context,
+            &mut self.grounded_common,
+            false
+        ) {
+            Some(FighterState::Fall(FallState))
+        } else {
+            None
         }
     }
+}
+
+pub fn check_input(state_context: &FighterStateContext, ground_state_common: &GroundedStateCommon) -> Option<FighterState> {
+    let input_frame = state_context.input.get_last_frame();
+    if input_frame.movement.x.abs() >= state_context.game_settings.input_common.run_stick_threshold
+    {
+        return Some(FighterState::Run(RunState { grounded_common: ground_state_common.clone() }));
+    }
+    None
+}

src/fighter/state/wait.rs

@@ -1,43 +1,69 @@
 use bevy::prelude::*;
 
-use super::{FighterState, FighterStateContext, FighterStateTransition, ground, walk};
+use super::{FighterStateImpl, FighterStateContext, FighterStateTransition, ground, walk};
+use crate::fighter::state::FighterState;
+use crate::fighter::state::fall::FallState;
+use crate::fighter::state::ground::{GroundedMotionResult, GroundedStateCommon};
 use crate::fighter::{FighterAttributes, FighterVelocity};
 use crate::game_settings::GameSettings;
+use crate::stage::line::StageLineID;
 
-#[derive(Component, Debug, Clone, Copy)]
-pub struct WaitState;
+#[derive(Debug, Clone, Hash)]
+pub struct WaitState {
+    pub grounded_common: GroundedStateCommon
+}
 
-impl FighterState for WaitState {
+impl FighterStateImpl for WaitState {
+    const NAME: &'static str = "Wait";
     fn check_interrupt(
         &self,
         state_context: &FighterStateContext,
-    ) -> Option<FighterStateTransition> {
-        walk::check_input(state_context)
+    ) -> Option<FighterState> {
+        walk::check_input(state_context, &self.grounded_common)
+    }
+    
+    fn on_enter(&mut self, _state_context: &mut super::FighterStateContext) {}
+    
+    fn update(&mut self, state_context: &mut super::FighterStateContext) {
+        let friction = if state_context.velocity.x.abs() > state_context.fighter_attribs.max_walk_vel {
+            state_context.fighter_attribs.ground_friction
+                * state_context.game_settings
+                    .figher_common
+                    .ground_friction_over_walk_speed_multiplier
+        } else {
+            state_context.fighter_attribs.ground_friction
+        };
+        state_context.velocity.x += ground::apply_grounded_friction(friction, state_context.velocity.x);
+
+        ground::apply_grounded_motion(
+            state_context.velocity,
+            state_context.translation,
+            state_context.prev_translation,
+        );
+    }
+    
+    fn check_collision_interrupt(
+        &mut self,
+        state_context: &mut FighterStateContext,
+    ) -> Option<FighterState> {
+        if let GroundedMotionResult::InAir = ground::collide_with_stage_grounded(
+            state_context,
+            &mut self.grounded_common,
+            false
+        ) {
+            Some(FighterState::Fall(FallState))
+        } else {
+            None
+        }
     }
 }
 
-pub fn check_input(state_context: &FighterStateContext) -> Option<FighterStateTransition> {
+pub fn check_input(state_context: &FighterStateContext, ground_state_common: &GroundedStateCommon) -> Option<FighterState> {
     let input_frame = state_context.input.get_last_frame();
 
     if input_frame.movement.x.abs() < state_context.game_settings.input_common.stick_deadzone {
-        return Some(FighterStateTransition::Wait);
+        return Some(FighterState::Wait(WaitState { grounded_common: ground_state_common.clone() }));
     }
     None
 }
 
-pub fn wait_update(
-    query: Query<(&FighterAttributes, &mut FighterVelocity), With<WaitState>>,
-    game_settings: Res<GameSettings>,
-) {
-    for (attribs, mut velocity) in query {
-        let friction = if velocity.x.abs() > attribs.max_walk_vel {
-            attribs.ground_friction
-                * game_settings
-                    .figher_common
-                    .ground_friction_over_walk_speed_multiplier
-        } else {
-            attribs.ground_friction
-        };
-        velocity.x += ground::apply_grounded_friction(friction, velocity.x);
-    }
-}

src/fighter/state/walk.rs

@@ -1,43 +1,67 @@
 use bevy::prelude::*;
 
-use super::{FighterState, FighterStateContext, FighterStateTransition, dash, ground, wait};
+use super::{FighterStateImpl, FighterStateContext, FighterStateTransition, dash, ground, wait};
+use crate::fighter::state::fall::FallState;
+use crate::fighter::state::ground::{GroundedMotionResult, GroundedStateCommon};
+use crate::fighter::state::{self, FighterState};
 use crate::fighter::{FighterAttributes, FighterVelocity};
 use crate::game_settings::GameSettings;
 use crate::input::FighterInput;
 
-#[derive(Component, Debug, Clone, Copy)]
-pub struct WalkState;
+#[derive(Debug, Clone, Hash)]
+pub struct WalkState {
+    pub grounded_common: GroundedStateCommon
+}
 
-impl FighterState for WalkState {
+impl FighterStateImpl for WalkState {
+    const NAME: &'static str = "Walk";
     fn check_interrupt(
         &self,
         state_context: &FighterStateContext,
-    ) -> Option<FighterStateTransition> {
-        wait::check_input(state_context).or_else(|| dash::check_input(state_context))
+    ) -> Option<FighterState> {
+        wait::check_input(state_context, &self.grounded_common).or_else(|| dash::check_input(state_context, &self.grounded_common))
+    }
+    
+    fn on_enter(&mut self, _state_context: &mut FighterStateContext) {}
+    
+    fn update(&mut self, state_context: &mut FighterStateContext) {
+        let last_frame = state_context.input.get_last_frame();
+        let (accel, target_vel) = state_context.fighter_attribs.get_accel_and_target_walk(&last_frame);
+
+        let accel =
+            ground::compute_ground_accel(accel, target_vel, state_context.velocity.x, state_context.fighter_attribs, &state_context.game_settings);
+
+        state_context.velocity.x += accel;
+
+        ground::apply_grounded_motion(
+            state_context.velocity,
+            state_context.translation,
+            state_context.prev_translation,
+        );
+    }
+    
+    fn check_collision_interrupt(
+        &mut self,
+        state_context: &mut FighterStateContext,
+    ) -> Option<FighterState> {
+        if let GroundedMotionResult::InAir = ground::collide_with_stage_grounded(
+            state_context,
+            &mut self.grounded_common,
+            false
+        ) {
+            Some(FighterState::Fall(FallState))
+        } else {
+            None
+        }
     }
 }
 
-pub fn check_input(state_context: &FighterStateContext) -> Option<FighterStateTransition> {
+pub fn check_input(state_context: &FighterStateContext, ground_state_common: &GroundedStateCommon) -> Option<FighterState> {
     let input_frame = state_context.input.get_last_frame();
 
     if input_frame.movement.x.abs() >= state_context.game_settings.input_common.stick_deadzone {
-        return Some(FighterStateTransition::Walk);
+        return Some(FighterState::Walk(WalkState { grounded_common: ground_state_common.clone() }));
     }
 
     None
 }
-
-pub fn walk_update(
-    fighters: Query<(&mut FighterVelocity, &FighterAttributes, &FighterInput), With<WalkState>>,
-    game_settings: Res<GameSettings>,
-) {
-    for (mut velocity, attributes, input) in fighters {
-        let last_frame = input.get_last_frame();
-        let (accel, target_vel) = attributes.get_accel_and_target_walk(&last_frame);
-
-        let accel =
-            ground::compute_ground_accel(accel, target_vel, velocity.x, attributes, &game_settings);
-
-        velocity.x += accel;
-    }
-}

src/lib.rs

@@ -21,30 +21,26 @@
 //! save, click Rebuild in jackdaw (or run `jd build`) and it
 //! appears in `Add Component`. No registration code is needed.
 
-use bevy::prelude::*;
+use bevy::{mesh::SphereMeshBuilder, prelude::*};
+use bevy_wind_waker_shader::prelude::*;
 use clap::Parser;
 use jackdaw_runtime::prelude::*;
 
 use crate::{
     fighter::{
-        FighterAttributes, FighterECB, FighterTranslation, FighterVelocity,
-        state::wait::WaitState,
-    },
-    game_settings::{FighterSettingsCommon, GameSettings, InputSettingsCommon},
-    input::FighterInput,
-    player::Player,
-    schedule::GameplaySchedulePlugin,
+        FighterAttributes, FighterECB, FighterTranslation, FighterVelocity, FighterVisual, animation::FighterAnimations, state::{FighterState, fall::FallState, wait::WaitState},
+    }, game_settings::{FighterSettingsCommon, GameSettings, InputSettingsCommon}, input::FighterInput, player::Player, schedule::GameplaySchedulePlugin,
 };
 
+mod args;
 pub mod fighter;
-pub mod input;
-pub mod stage;
 pub mod game_settings;
+pub mod input;
+mod math;
 pub mod netcode;
 pub mod player;
 pub mod schedule;
-mod math;
-mod args;
+pub mod stage;
 
 /// Your game's Bevy plugin. The editor finds it by this name (override
 /// with `plugin = "..."` in jackdaw.toml) and runs it on Play; the
@@ -52,13 +48,19 @@ mod args;
 #[derive(Default)]
 pub struct GamePlugin;
 
-pub fn setup(mut commands: Commands) {
-    let _fighter = commands
+pub fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
+    // debug stage
+
+    let _stage = commands.spawn((
+        WorldAssetRoot(asset_server.load("stages/YoshiStory.glb#Scene0")),
+        Transform::from_scale(Vec3::splat(0.1)),
+    ));
+
+    let _fighter =
+        commands
             .spawn((
                 Name("Fighter".into()),
-            Player {
-                handle: 0,
-            },
+                Player { handle: 0 },
                 FighterECB {
                     vertical_half: 0.5,
                     horizontal_half: 0.25,
@@ -74,10 +76,22 @@ pub fn setup(mut commands: Commands) {
                     base_dash_accel: 0.002,
                     stick_dash_accel: 0.01,
                     max_dash_vel: 0.22,
+                    jump_vertical_velocity: 0.25,
                     dash_initial_velocity: 0.19,
+                    terminal_velocity: 0.28,
+                    gravity: 0.023,
                 },
-            WaitState {},
-            FighterInput::default()
+                FighterState::Fall(FallState),
+                FighterInput::default(),
+                FighterAnimations {
+                    wait: asset_server.load("fighters/jiggs/jigglypuff-normal.glb#PlyPurin5K_Share_ACTION_Wait")
+                }
+            ))
+            .with_child((
+                FighterVisual,
+                WorldAssetRoot(asset_server.load(
+                    GltfAssetLabel::Scene(0).from_asset("fighters/jiggs/jigglypuff-normal.glb"),
+                )),
             ))
             .id();
 }
@@ -88,6 +102,7 @@ impl Plugin for GamePlugin {
         // resources; this plugin only wires them together and supplies the
         // game-level content and configuration.
         app.add_plugins((
+            WindWakerShaderPlugin::default(),
             // Brings up GGRS (and with it `GgrsSchedule`), so it goes first.
             netcode::FighterNetcodePlugin::default(),
             GameplaySchedulePlugin,
@@ -102,7 +117,7 @@ impl Plugin for GamePlugin {
             figher_common: FighterSettingsCommon {
                 walk_speed_ease: 0.5,
                 ground_max_horizontal_velocity: 0.3,
-                    ground_friction_over_walk_speed_multiplier: 2.0
+                ground_friction_over_walk_speed_multiplier: 2.0,
             },
             input_common: InputSettingsCommon::default(),
         });

src/math.rs

@@ -1,33 +0,0 @@
-use bevy::math::{Vec2, primitives::Segment2d};
-
-pub trait SegmentIntersection {
-    fn segment_intersection(&self, rhs: &Segment2d) -> Option<Vec2>;
-}
-
-impl SegmentIntersection for Segment2d {
-    fn segment_intersection(&self, rhs: &Segment2d) -> Option<Vec2> {
-        let p0 = self.point1();
-        let p1 = self.point2();
-        let p2 = rhs.point1();
-        let p3 = rhs.point2();
-        
-        let s1_x = p1.x - p0.x;
-        let s1_y = p1.y - p0.y;
-        let s2_x = p3.x - p2.x;
-        let s2_y = p3.y - p2.y;
-
-        let denom = -s2_x * s1_y + s1_x * s2_y;
-        if denom.abs() < f32::EPSILON {
-            return None; // Parallel or collinear
-        }
-
-        let s = (-s1_y * (p0.x - p2.x) + s1_x * (p0.y - p2.y)) / denom;
-        let t = ( s2_x * (p0.y - p2.y) - s2_y * (p0.x - p2.x)) / denom;
-
-        if s >= 0.0 && s <= 1.0 && t >= 0.0 && t <= 1.0 {
-            Some(Vec2::new(p0.x + (t * s1_x), p0.y + (t * s1_y)))
-        } else {
-            None
-        }
-    }
-}

src/math/int.rs

@@ -0,0 +1,5 @@
+use bevy::math::{Vec2, primitives::Segment2d};
+
+use fixed::prelude::*;
+
+pub type FGi32 = fixed::FixedI32<fixed::types::extra::U16>;

src/math/mod.rs

@@ -0,0 +1,3 @@
+pub mod int;
+pub mod segment;
+pub mod vec;

src/math/segment.rs

@@ -0,0 +1,92 @@
+use bevy::math::{Vec2, primitives::Segment2d};
+
+use fixed::prelude::*;
+
+use crate::math::vec::FGVec2;
+
+type FGi32 = fixed::FixedI32<fixed::types::extra::U16>;
+
+#[derive(Clone, Copy, PartialEq)]
+pub struct FGSegment2d {
+    point1: FGVec2,
+    point2: FGVec2
+}
+
+impl FGSegment2d {
+    #[inline]
+    pub fn new(point1: FGVec2, point2: FGVec2) -> Self {
+        Self {
+            point1, point2
+        }
+    }
+
+    #[inline]
+    pub fn point1(&self) -> FGVec2 {
+        self.point1
+    }
+
+    #[inline]
+    pub fn point2(&self) -> FGVec2 {
+        self.point2
+    }
+}
+
+pub trait SegmentIntersection {
+    fn segment_intersection(&self, rhs: &Segment2d) -> Option<FGVec2>;
+}
+
+impl SegmentIntersection for Segment2d {
+    fn segment_intersection(&self, rhs: &Segment2d) -> Option<Vec2> {
+        let p0 = self.point1();
+        let p1 = self.point2();
+        let p2 = rhs.point1();
+        let p3 = rhs.point2();
+        
+        let s1_x = p1.x - p0.x;
+        let s1_y = p1.y - p0.y;
+        let s2_x = p3.x - p2.x;
+        let s2_y = p3.y - p2.y;
+
+        let denom = -s2_x * s1_y + s1_x * s2_y;
+        if denom.abs() < f32::EPSILON {
+            return None; // Parallel or collinear
+        }
+
+        let s = (-s1_y * (p0.x - p2.x) + s1_x * (p0.y - p2.y)) / denom;
+        let t = ( s2_x * (p0.y - p2.y) - s2_y * (p0.x - p2.x)) / denom;
+
+        if s >= 0.0 && s <= 1.0 && t >= 0.0 && t <= 1.0 {
+            Some(Vec2::new(p0.x + (t * s1_x), p0.y + (t * s1_y)))
+        } else {
+            None
+        }
+    }
+}
+
+impl SegmentIntersection for Segment2d {
+    fn segment_intersection(&self, rhs: &Segment2d) -> Option<Vec2> {
+        let p0 = self.point1();
+        let p1 = self.point2();
+        let p2 = rhs.point1();
+        let p3 = rhs.point2();
+        
+        let s1_x = p1.x - p0.x;
+        let s1_y = p1.y - p0.y;
+        let s2_x = p3.x - p2.x;
+        let s2_y = p3.y - p2.y;
+
+        let denom = -s2_x * s1_y + s1_x * s2_y;
+        if denom.abs() < f32::EPSILON {
+            return None; // Parallel or collinear
+        }
+
+        let s = (-s1_y * (p0.x - p2.x) + s1_x * (p0.y - p2.y)) / denom;
+        let t = ( s2_x * (p0.y - p2.y) - s2_y * (p0.x - p2.x)) / denom;
+
+        if s >= 0.0 && s <= 1.0 && t >= 0.0 && t <= 1.0 {
+            Some(Vec2::new(p0.x + (t * s1_x), p0.y + (t * s1_y)))
+        } else {
+            None
+        }
+    }
+}

src/math/vec.rs

@@ -0,0 +1,115 @@
+use bevy::math::Vec2;
+use std::ops::{Add, Div, Mul, Sub};
+
+use super::int::FGi32;
+
+#[derive(Clone, Copy, PartialEq)]
+pub struct FGVec2 {
+    pub x: FGi32,
+    pub y: FGi32,
+}
+
+impl FGVec2 {
+    pub const ZERO: Self = Self::new(FGi32::ZERO, FGi32::ZERO);
+
+    #[inline(always)]
+    pub const fn new(x: FGi32, y: FGi32) -> Self {
+        Self { x, y }
+    }
+
+    #[inline(always)]
+    pub fn from_i32(x: i32, y: i32) -> Self {
+        Self {
+            x: FGi32::from_num(x),
+            y: FGi32::from_num(y),
+        }
+    }
+
+    #[inline]
+    pub fn length_squared(&self) -> FGi32 {
+        self.x * self.x + self.y * self.y
+    }
+
+    #[inline]
+    pub fn length(&self) -> FGi32 {
+        (self.x * self.x + self.y * self.y).sqrt()
+    }
+
+    #[inline]
+    pub fn normalized_or_zero(&self) -> Self {
+        let len = self.length();
+        if len.is_zero() {
+            Self::ZERO
+        } else {
+            self / len
+        }
+    }
+
+    #[inline]
+    pub fn to_vec2(&self) -> Vec2 {
+        Vec2::new(self.x.to_num(), self.y.to_num())
+    }
+}
+
+impl Mul for FGVec2 {
+    type Output = Self;
+
+    #[inline]
+    fn mul(self, rhs: Self) -> Self::Output {
+        Self::new(self.x * rhs.x, self.y * rhs.y)
+    }
+}
+
+impl Add for FGVec2 {
+    type Output = Self;
+
+    #[inline]
+    fn add(self, rhs: Self) -> Self::Output {
+        Self::new(self.x + rhs.x, self.y + rhs.y)
+    }
+}
+
+impl Sub for FGVec2 {
+    type Output = Self;
+
+    #[inline]
+    fn sub(self, rhs: Self) -> Self::Output {
+        Self::new(self.x - rhs.x, self.y - rhs.y)
+    }
+}
+
+impl Div for FGVec2 {
+    type Output = Self;
+
+    #[inline]
+    fn div(self, rhs: Self) -> Self::Output {
+        Self::new(self.x / rhs.x, self.y / rhs.y)
+    }
+}
+
+impl Mul<FGi32> for FGVec2 {
+    type Output = Self;
+
+    #[inline]
+    fn mul(self, rhs: FGi32) -> Self::Output {
+        Self::new(self.x * rhs, self.y * rhs)
+    }
+}
+
+impl Div<FGi32> for FGVec2 {
+    type Output = Self;
+
+    #[inline]
+    fn div(self, rhs: FGi32) -> Self::Output {
+        Self::new(self.x / rhs, self.y / rhs)
+    }
+}
+
+impl Div<FGi32> for &FGVec2 {
+    type Output = FGVec2;
+
+    #[inline]
+    fn div(self, rhs: FGi32) -> Self::Output {
+        (*self).div(rhs)
+    }
+}

src/player.rs

@@ -8,7 +8,7 @@ use bevy_ggrs::prelude::*;
 /// root rather than in `netcode` because "which player is this" is a game
 /// concept; `netcode` only decides where the inputs come from.
 #[derive(Default, Component)]
-#[require(Rollback)]
+#[require(Rollback, Transform)]
 pub struct Player {
     pub handle: usize,
 }

src/schedule.rs

@@ -21,6 +21,7 @@ pub enum GameplaySet {
     Physics,
     /// Resolve the integrated positions against the stage.
     Collision,
+    Animation
 }
 
 /// Declares the order of [`GameplaySet`] inside [`GgrsSchedule`]. Added by
@@ -37,6 +38,7 @@ impl Plugin for GameplaySchedulePlugin {
                 GameplaySet::StateUpdate,
                 GameplaySet::Physics,
                 GameplaySet::Collision,
+                GameplaySet::Animation,
             )
                 .chain(),
         );

src/stage/debug.rs

@@ -1,16 +1,19 @@
 use bevy::{color::palettes::css::RED, prelude::*};
 
-use crate::stage::StageLine;
+use crate::stage::{StagePoly, line::StageCollision};
 
-pub fn debug_draw_scene(mut gizmos: Gizmos, planes: Query<&StageLine>) {
-    for plane in planes {
-        let from = plane.segment.point1();
-        let to = plane.segment.point2();
+pub fn debug_draw_scene(mut gizmos: Gizmos, stage_collision: Res<StageCollision>) {
+    for poly in stage_collision.stage_polys.iter() {
+        for segment in poly.segments.iter() {
+            let from = segment.segment.point1();
+            let to = segment.segment.point2();
             let from_3d = Vec3::new(from.x, from.y, 0.0);
             let end_3d = Vec3::new(to.x, to.y, 0.0);
-        let normal_3d = Vec3::new(plane.normal.x, plane.normal.y, 0.0);
+            let normal_3d = Vec3::new(segment.normal.x, segment.normal.y, 0.0);
             gizmos.line(from_3d, end_3d, RED);
             let midpoint = (from_3d + end_3d) * 0.5;
             gizmos.arrow(midpoint, midpoint + normal_3d, RED);
         }
+
+    }
 }

src/stage/line.rs

@@ -1,34 +1,145 @@
 //! Stage collision geometry.
 
+use std::default;
+
 use bevy::{math::InvalidDirectionError, prelude::*};
 
-use crate::math::SegmentIntersection;
+use crate::math::segment::SegmentIntersection;
+
+#[derive(Reflect, Clone, Copy, PartialEq)]
+pub enum StagePolyLineSegmentType {
+    Floor, Wall, Ceiling
+}
+
+
+#[derive(Reflect, Clone)]
+pub struct StagePolyLineSegment {
+    pub segment: Segment2d,
+    pub normal: Vec2,
+    pub segment_type: StagePolyLineSegmentType
+}
+
+#[derive(Reflect, Clone, Default)]
+pub enum StagePolyType {
+    #[default]
+    Closed,
+    Platform
+}
+
+#[derive(Reflect, Hash, Debug, Clone, Copy, Default)]
+pub struct StageLineID {
+    pub polygon: usize,
+    pub segment: usize
+}
 
 #[derive(Component, Reflect, Clone, Default)]
 #[reflect(Component)]
-pub struct StageLine {
-    pub segment: Segment2d,
-    pub normal: Vec2,
+pub struct StagePoly {
+    poly_type: StagePolyType,
+    pub segments: Vec<StagePolyLineSegment>
 }
 
 pub struct StagePlaneIntersectResult {
     pub position: Vec2,
+    pub segment_idx: usize,
+    pub normal: Vec2
 }
 
-impl StageLine {
-    pub fn new(start: Vec2, end: Vec2) -> Result<Self, InvalidDirectionError> {
-        let segment = Segment2d::new(start, end);
-        let normal = segment.left_normal().as_vec2();
-        Ok(Self { segment, normal })
+#[derive(Resource, Reflect, Clone, Default)]
+#[reflect(Resource)]
+pub struct StageCollision {
+    pub stage_polys: Vec<StagePoly>
 }
 
-    pub fn intersect_ray(&self, segment: Segment2d) -> Option<StagePlaneIntersectResult> {
-        self.segment
-            .segment_intersection(&segment)
-            .map(|position| StagePlaneIntersectResult { position })
+impl StagePoly {
+    pub fn intersect_ray(&self, ray_segment: Segment2d) -> Option<StagePlaneIntersectResult> {
+        for (i, segment) in self.segments.iter().enumerate() {
+            if let Some(intersection) = segment.segment.segment_intersection(&ray_segment) {
+                println!("DIST3 {} {}", intersection, segment.segment.closest_point(intersection));
+                return Some(StagePlaneIntersectResult {
+                    position: intersection,
+                    segment_idx: i,
+                    normal: segment.normal
+                });
+            }
+        }
+        None
     }
 
+    pub fn get_segment(&self, segment_idx: usize) -> Option<&StagePolyLineSegment> {
+        self.segments.get(segment_idx)
+    }
+
+    pub fn get_next_segment(&self, segment_idx: usize) -> Option<&StagePolyLineSegment> {
+        self.segments.get(segment_idx % segment_idx + 1)
+    }
+
+    pub fn get_prev_segment(&self, segment_idx: usize) -> Option<&StagePolyLineSegment> {
+        self.segments.get(segment_idx % segment_idx + 1)
+    }
+
+    pub fn build(poly_type: StagePolyType, points: &[(Vec2, StagePolyLineSegmentType)]) -> Self {
+        let windows = points.iter().zip(points.iter().cycle().skip(1));
+
+        let segments = windows.map(|segment_window| {
+            let (first_point, segment_type) = segment_window.0;
+            let (second_point, _) = segment_window.1;
+            let segment = Segment2d::new(*first_point, *second_point);
+            StagePolyLineSegment {
+                segment_type: *segment_type,
+                segment,
+                normal: segment.left_normal().as_vec2()
+            }
+        }).collect();
+
+        Self {
+            poly_type,
+            segments
+        }
+    }
+}
+
+impl StagePolyLineSegment {
     pub fn project(&self, vec: Vec2) -> Vec2 {
         vec - vec.project_onto_normalized(self.normal)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn ray_intersection_test() {
+        let stage_poly = StagePoly::build(crate::stage::line::StagePolyType::Platform, &[
+            (Vec2::new(-4.5, 0.0), StagePolyLineSegmentType::Floor),
+            (Vec2::new(4.5, 0.0), StagePolyLineSegmentType::Floor),
+        ]);
+
+        let res = stage_poly.intersect_ray(Segment2d::new(Vec2::new(0.0, 1.0), Vec2::new(0.0, -1.0)));
+        assert!(res.is_some());
+        assert_eq!(res.unwrap().position, Vec2::ZERO);
+    }
+
+    #[test]
+    fn ray_intersection_test_side() {
+        let stage_poly = StagePoly::build(crate::stage::line::StagePolyType::Platform, &[
+            (Vec2::new(-4.5, 0.0), StagePolyLineSegmentType::Floor),
+            (Vec2::new(4.5, 0.0), StagePolyLineSegmentType::Floor),
+        ]);
+
+        let res = stage_poly.intersect_ray(Segment2d::new(Vec2::new(2.0, 1.0), Vec2::new(2.0, -1.0)));
+        assert!(res.is_some());
+        assert_eq!(res.unwrap().position, Vec2::new(2.0, 0.0));
+    }
+    #[test]
+    fn ray_intersection_test_diagonal() {
+        let stage_poly = StagePoly::build(crate::stage::line::StagePolyType::Platform, &[
+            (Vec2::new(0.0, 0.0), StagePolyLineSegmentType::Floor),
+            (Vec2::new(2.0, 2.0), StagePolyLineSegmentType::Floor),
+        ]);
+
+        let res = stage_poly.intersect_ray(Segment2d::new(Vec2::new(1.0, 2.0), Vec2::new(1.0, -2.0)));
+        assert!(res.is_some());
+        assert_eq!(res.unwrap().position, Vec2::new(1.0, 1.0));
+    }
+}

src/stage/mod.rs

@@ -7,7 +7,7 @@ pub mod debug;
 pub mod line;
 pub mod scene;
 
-pub use line::{StageLine, StagePlaneIntersectResult};
+pub use line::{StagePoly, StagePlaneIntersectResult};
 
 /// Owns the stage geometry: which scene gets spawned and how it is drawn.
 #[derive(Default)]

src/stage/scene.rs

@@ -1,37 +1,49 @@
 //! The scene content that gets spawned at startup.
 
-use bevy::prelude::*;
+use std::f32::consts::PI;
 
-use crate::stage::StageLine;
+use bevy::{camera_controller::free_camera::FreeCamera, prelude::*};
+
+use crate::stage::{StagePoly, line::StagePolyLineSegmentType, line::StageCollision};
 
 /// set up a simple 3D scene
 pub fn test_scene() -> impl SceneList {
+
+    let stage_poly = StagePoly::build(crate::stage::line::StagePolyType::Closed, &[
+        (Vec2::new(-5.6, -0.35), StagePolyLineSegmentType::Floor),
+        (Vec2::new(-3.92, 0.0), StagePolyLineSegmentType::Floor),
+        (Vec2::new(0.0, 0.0), StagePolyLineSegmentType::Floor),
+        (Vec2::new(3.92, 0.0), StagePolyLineSegmentType::Floor),
+        (Vec2::new(5.6, -0.35), StagePolyLineSegmentType::Wall),
+        (Vec2::new(5.6, -20.0), StagePolyLineSegmentType::Ceiling),
+        (Vec2::new(-5.6, -20.0), StagePolyLineSegmentType::Wall)
+    ]);
+
     bsn_list! [
         (
-            #Cube
-            Mesh3d(asset_value(Cuboid::new(5.0, 1.0, 1.0)))
-            MeshMaterial3d::<StandardMaterial>(asset_value(Color::srgb_u8(124, 144, 255)))
-            Transform::from_xyz(0.0, 0.5, 0.0)
+            #StageCollision
+            template_value(StageCollision {
+                stage_polys: vec!(stage_poly)
+            })
         ),
         (
-            #StagePlane
-            template_value(StageLine::new(Vec2::new(-2.5, 1.0), Vec2::new(2.5, 1.0)).unwrap())
-        ),
-        (
-            PointLight {
+            DirectionalLight {
                 shadow_maps_enabled: true,
             }
-            Transform::from_xyz(4.0, 8.0, 4.0)
+            Transform {
+                translation: Vec3::new(0.0, 2.0, 0.0),
+                rotation: Quat::from_rotation_x(-PI / 4.),
+            }
         ),
         (
             Camera3d
             template_value(Transform::from_xyz(0.0, 1.5, 9.0))
-            /*FreeCamera {
+            FreeCamera {
                 sensitivity: 0.2,
                 friction: 25.0,
                 walk_speed: 3.0,
                 run_speed: 9.0,
-            }*/
+            }
         )
     ]
 }