Remove stray assets dir

.gitea/workflows/ci.yml

@@ -63,6 +63,7 @@ jobs:
             libxkbcommon-dev \
             libxkbcommon-x11-0 \
             mesa-vulkan-drivers \
+            blender \
             mold \
             pkg-config
 
@@ -129,54 +130,22 @@ jobs:
             libusb-1.0-0-dev \
             libwayland-dev \
             libx11-dev \
-            libxfixes3 \
-            libxi6 \
             libxkbcommon-dev \
             libxkbcommon-x11-0 \
-            blender \
             lld-19 \
             llvm-19 \
             mesa-vulkan-drivers \
             mold \
+            blender \
             pkg-config
           sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-19 100
           sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-19 100
           echo "/usr/lib/llvm-19/bin" >> "$GITHUB_PATH"
           rm -f "$HOME/.cache/cargo-xwin/clang-cl"
 
-      - name: Install pinned Blender
-        run: |
-          scripts/install-blender.sh "$RUNNER_TEMP/blender"
-          echo "BLENDER=$RUNNER_TEMP/blender/blender" >> "$GITHUB_ENV"
-
       - name: Preprocess assets
         run: cargo run --locked --bin process-assets --no-default-features --features debug_features -j 4
 
-      - name: Verify processed battlefield asset
-        run: |
-          python3 - <<'PY'
-          import json
-          import struct
-
-          path = "imported_assets/Default/stages/battlefield/bf2.blend"
-          with open(path, "rb") as asset:
-              header = asset.read(12)
-              if len(header) != 12:
-                  raise SystemExit(f"processed asset is truncated: {path}")
-              magic, version, length = struct.unpack("<4sII", header)
-              if magic != b"glTF" or version != 2 or length != asset.seek(0, 2):
-                  raise SystemExit(f"processed asset is not a valid GLB: {path}")
-              asset.seek(12)
-              json_length, chunk_type = struct.unpack("<II", asset.read(8))
-              if chunk_type != 0x4E4F534A:
-                  raise SystemExit(f"processed asset has no JSON chunk: {path}")
-              document = json.loads(asset.read(json_length))
-          meshes = document.get("meshes", [])
-          if not meshes:
-              raise SystemExit(f"processed asset contains no meshes: {path}")
-          print(f"{path}: {len(meshes)} meshes, {length} bytes")
-          PY
-
       - name: Build production binary
         run: cargo build --locked --profile production --no-default-features --features debug_features -j 4
 

scripts/install-blender.sh

@@ -1,30 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-version="5.2.2"
-sha256="84098912789dc450e95697c4184fb8a90acbe5111c2ba4aede3fecb57806a168"
-install_dir="${1:-${BLENDER_INSTALL_DIR:-${HOME}/.local/blender-${version}}}"
-
-if [[ "$(uname -s)" != Linux || "$(uname -m)" != x86_64 ]]; then
-    echo "error: this installer currently supports Linux x86_64 only" >&2
-    exit 1
-fi
-
-if [[ -x "$install_dir/blender" ]]; then
-    "$install_dir/blender" --version | head -n 1
-    exit 0
-fi
-
-mkdir -p "$(dirname "$install_dir")"
-tmp_dir="$(mktemp -d)"
-trap 'rm -rf "$tmp_dir"' EXIT
-
-archive="blender-${version}-linux-x64.tar.xz"
-url="https://download.blender.org/release/Blender5.2/${archive}"
-
-curl --fail --location --silent --show-error --output "$tmp_dir/$archive" "$url"
-printf '%s  %s\n' "$sha256" "$tmp_dir/$archive" | sha256sum --check --status
-tar --extract --xz --file "$tmp_dir/$archive" --directory "$tmp_dir"
-mv "$tmp_dir/blender-${version}-linux-x64" "$install_dir"
-
-"$install_dir/blender" --version | head -n 1

src/blend_asset.rs

@@ -84,11 +84,10 @@ impl AssetLoader for BlendSourceLoader {
             .arg(&blend_path)
             .arg("--python")
             .arg(&script)
-            .arg("--")
+        .arg("--")
-            .arg(&output)
+        .arg(&output)
-            .arg(&actions_path)
+        .arg(&actions_path)
-            .arg(&blend_path)
+        .output()
-            .output()
             .map_err(|error| io::Error::other(format!("failed to start Blender: {error}")))?;
         if !result.status.success() {
             return Err(io::Error::other(format!(
@@ -107,7 +106,6 @@ impl AssetLoader for BlendSourceLoader {
         let mut dependencies = manifest.dependencies;
         let document: serde_json::Value = serde_json::from_slice(&fs::read(&output)?)
             .map_err(|error| io::Error::new(io::ErrorKind::InvalidData, error))?;
-        validate_export(&document, &output)?;
         if let Some(images) = document.get("images").and_then(serde_json::Value::as_array) {
             for image in images {
                 if let Some(uri) = image.get("uri").and_then(serde_json::Value::as_str) {
@@ -144,22 +142,6 @@ impl AssetLoader for BlendSourceLoader {
     }
 }
 
-fn validate_export(document: &serde_json::Value, output: &Path) -> io::Result<()> {
-    for key in ["scenes", "nodes", "meshes"] {
-        let count = document
-            .get(key)
-            .and_then(serde_json::Value::as_array)
-            .map_or(0, Vec::len);
-        if count == 0 {
-            return Err(io::Error::new(
-                io::ErrorKind::InvalidData,
-                format!("Blender export {} contains no {key}", output.display()),
-            ));
-        }
-    }
-    Ok(())
-}
-
 async fn referenced_actions(
     load_context: &mut LoadContext<'_>,
     root: &Path,

src/blend_asset/export.py

@@ -7,15 +7,6 @@ import sys
 def main():
     output = sys.argv[sys.argv.index("--") + 1]
     actions_path = sys.argv[sys.argv.index("--") + 2]
-    source_path = sys.argv[sys.argv.index("--") + 3]
-    loaded_path = os.path.realpath(bpy.data.filepath)
-    expected_path = os.path.realpath(source_path)
-    if loaded_path != expected_path:
-        raise RuntimeError(
-            f"Blender loaded {loaded_path!r} instead of {expected_path!r}"
-        )
-    if not bpy.data.objects or not bpy.data.meshes:
-        raise RuntimeError("Blender loaded an empty scene")
     with open(actions_path) as file:
         actions_to_keep = set(json.load(file))
 

src/debug_tools/save_state.rs

@@ -1,22 +1,12 @@
 use bevy::prelude::*;
 
 use crate::{
-    camera::MatchCamera,
+    camera::MatchCamera, fighter::{
-    fighter::{
+        FighterECB, FighterFacingDirection, FighterHitboxes, FighterHitstop, FighterHitstopShake, FighterPreviousFacingDirection, FighterPreviousTranslation, FighterTranslation, FighterVelocity, Grounded, animation::FighterAnimationFrame, attack::{
-        FighterECB, FighterFacingDirection, FighterHitboxes, FighterHitstop, FighterHitstopShake,
-        FighterPreviousFacingDirection, FighterPreviousTranslation, FighterSurfaceState,
-        FighterTranslation, FighterVelocity,
-        animation::FighterAnimationFrame,
-        attack::{
             FighterDamage, FighterKnockbackVelocity, FighterPendingHitReaction, FighterPendingHits,
             FighterSolvedHurtboxes, FighterStaleMoveQueue,
-        },
+        }, baked_animation::FighterBoneMatrices, state::FighterState,
-        baked_animation::FighterBoneMatrices,
+    }, input::FighterInput, player::Player, stage::line::StageCollision,
-        state::FighterState,
-    },
-    input::FighterInput,
-    player::Player,
-    stage::line::StageCollision,
 };
 
 #[derive(Resource, Default)]
@@ -54,7 +44,7 @@ struct FighterCheckpoint {
     hitboxes: FighterHitboxes,
     solved_hurtboxes: FighterSolvedHurtboxes,
     bone_matrices: FighterBoneMatrices,
-    surface: FighterSurfaceState,
+    grounded: bool,
 }
 
 pub(super) fn save_or_restore(world: &mut World) {
@@ -153,7 +143,11 @@ pub(super) fn save_or_restore(world: &mut World) {
         entity.insert(saved.hitboxes.clone());
         entity.insert(saved.solved_hurtboxes.clone());
         entity.insert(saved.bone_matrices.clone());
-        entity.insert(saved.surface);
+        if saved.grounded {
+            entity.insert(Grounded);
+        } else {
+            entity.remove::<Grounded>();
+        }
     }
     world.insert_resource(checkpoint.pending_hits.clone());
     world.insert_resource(checkpoint.stage_collision);
@@ -187,7 +181,7 @@ fn capture_fighter(world: &World, entity: Entity) -> Option<FighterCheckpoint> {
         hitboxes: fighter.get::<FighterHitboxes>()?.clone(),
         solved_hurtboxes: fighter.get::<FighterSolvedHurtboxes>()?.clone(),
         bone_matrices: fighter.get::<FighterBoneMatrices>()?.clone(),
-        surface: *fighter.get::<FighterSurfaceState>()?,
+        grounded: fighter.contains::<Grounded>(),
     })
 }
 

src/fighter/mod.rs

@@ -18,7 +18,6 @@ pub mod hurtbox;
 pub mod manifest;
 pub mod motion;
 pub mod state;
-pub mod surface;
 pub mod visual;
 
 // The fighter components are re-exported so the rest of the crate can say
@@ -29,29 +28,18 @@ pub use attributes::FighterAttributes;
 pub use ecb::FighterECB;
 pub use manifest::FighterId;
 pub use motion::{
-    FighterPreviousFacingDirection, FighterPreviousTranslation, FighterTranslation, FighterVelocity,
+    FighterPreviousFacingDirection, FighterPreviousTranslation, FighterTranslation,
+    FighterVelocity, Grounded,
 };
-pub use surface::FighterSurfaceState;
 
 use crate::{
-    AppState,
+    AppState, fighter::{
-    fighter::{
         attack::{
             AttackKind, FighterAttackPlugin, FighterAttackScriptAssets, FighterDamage,
             FighterKnockbackVelocity, FighterPendingHitReaction, FighterSolvedHurtboxes,
             FighterStaleMoveQueue,
-        },
+        }, baked_animation::{FighterBoneIndexMap, FighterBoneMatrices}, manifest::FighterManifest, state::{FighterState, air::AirborneStateCommon, fall::FallState}, visual::FighterAnimations,
-        baked_animation::{FighterBoneIndexMap, FighterBoneMatrices},
+    }, input::FighterInput, math::{int::FGi32, vec::FGVec2}, player::Player, schedule::GameplaySet, scripting::FighterAttackScript, stage::line::StageCollision,
-        manifest::FighterManifest,
-        state::{FighterState, air::AirborneStateCommon, fall::FallState},
-        visual::FighterAnimations,
-    },
-    input::FighterInput,
-    math::{int::FGi32, vec::FGVec2},
-    player::Player,
-    schedule::GameplaySet,
-    scripting::FighterAttackScript,
-    stage::line::StageCollision,
 };
 use state::state_interrupt_system;
 
@@ -70,14 +58,14 @@ pub enum FighterFacingDirection {
 pub enum FighterHitstopShakeKind {
     #[default]
     Horizontal,
-    Vertical,
+    Vertical
 }
 
 #[derive(Component, Copy, Clone, Hash, Debug, PartialEq, Reflect, Default)]
 pub enum FighterHitstopShakeRole {
     #[default]
     Attacker,
-    Receiver,
+    Receiver
 }
 
 #[derive(Component, Default, Copy, Clone, Hash)]
@@ -85,7 +73,7 @@ pub struct FighterHitstopShake {
     pub remaining_frames: u32,
     pub total_frames: u32,
     pub kind: FighterHitstopShakeKind,
-    pub role: FighterHitstopShakeRole,
+    pub role: FighterHitstopShakeRole
 }
 
 #[derive(Component, Default, Copy, Clone, Hash)]
@@ -145,7 +133,7 @@ pub struct FighterVisual;
     FighterPendingHitReaction,
     FighterHitstop,
     FighterKnockbackVelocity,
-    FighterTranslation
+    FighterTranslation,
 )]
 pub struct Fighter {
     pub manifest: Handle<FighterManifest>,
@@ -212,8 +200,8 @@ impl Plugin for FighterPlugin {
             .checksum_component_with_hash::<FighterPreviousFacingDirection>()
             .rollback_component_with_copy::<animation::FighterAnimationFrame>()
             .checksum_component_with_hash::<animation::FighterAnimationFrame>()
-            .rollback_component_with_copy::<FighterSurfaceState>()
+            .rollback_component_with_copy::<Grounded>()
-            .checksum_component_with_hash::<FighterSurfaceState>()
+            .checksum_component_with_hash::<Grounded>()
             .rollback_component_with_copy::<FighterFacingDirection>()
             .rollback_component_with_copy::<FighterDamage>()
             .checksum_component_with_hash::<FighterDamage>()
@@ -271,7 +259,7 @@ pub struct FighterActiveAttack {
     pub active_hitboxes: Vec<usize>,
     pub solved_hitboxes: Vec<attack::FighterSolvedHitbox>,
     pub hit_fighters: Vec<Entity>,
-    pub stalled: bool,
+    pub stalled: bool
 }
 
 #[derive(Component, Clone, Debug, Default, Hash)]
@@ -296,7 +284,6 @@ pub fn spawn_fighter(
             Fighter { manifest: manifest },
             FighterFacingDirection::Right,
             FighterPreviousFacingDirection(FighterFacingDirection::Right),
-            FighterSurfaceState::Airborne,
             Transform::from_scale(Vec3::splat(model_scale.to_num())),
             (
                 FighterECB {

src/fighter/motion.rs

@@ -5,7 +5,7 @@ use bevy::prelude::*;
 use bevy_ggrs::GgrsFrameTiming;
 
 use crate::debug_tools::PresentationMotionMode;
-use crate::fighter::FighterHitstopShake;
+use crate::fighter::{FighterHitstopShake};
 use crate::game_settings::GameSettings;
 use crate::{
     fighter::{FighterECB, FighterFacingDirection, baked_animation::FixedMat4},
@@ -15,6 +15,9 @@ use crate::{
 #[derive(Component, Clone, Copy, Hash)]
 pub struct FighterPreviousFacingDirection(pub FighterFacingDirection);
 
+#[derive(Component, Clone, Copy, Hash)]
+pub struct Grounded;
+
 #[derive(Component, Deref, DerefMut, Default, Debug, Clone, Copy, Hash)]
 pub struct FighterVelocity(pub FGVec2);
 
@@ -79,29 +82,19 @@ pub fn apply_fighter_translation_to_visuals(
             0.0,
         );
 
-        if hitstop_shake.remaining_frames > 0
+        if hitstop_shake.remaining_frames > 0 && hitstop_shake.total_frames > 0 && !game_settings.fighter_common.visual_shake_table.is_empty() {
-            && hitstop_shake.total_frames > 0
-            && !game_settings.fighter_common.visual_shake_table.is_empty()
-        {
             let total = hitstop_shake.total_frames as f32;
             let curr = hitstop_shake.remaining_frames as f32;
             let elapsed = 1.0 - curr / total;
 
-            let access_index = (hitstop_shake.remaining_frames as usize)
+            
-                % game_settings.fighter_common.visual_shake_table.len();
+            let access_index = (hitstop_shake.remaining_frames as usize) % game_settings.fighter_common.visual_shake_table.len();
             let shake_multiplier = match hitstop_shake.role {
-                super::FighterHitstopShakeRole::Attacker => {
+                super::FighterHitstopShakeRole::Attacker => game_settings.fighter_common.attacker_visual_shake_multiplier,
-                    game_settings
-                        .fighter_common
-                        .attacker_visual_shake_multiplier
-                }
                 super::FighterHitstopShakeRole::Receiver => 1.0,
             };
-            let shake_amount: f32 =
+            let shake_amount: f32 = 1.0 - EaseFunction::QuinticIn.sample(elapsed).unwrap_or_default();
-                1.0 - EaseFunction::QuinticIn.sample(elapsed).unwrap_or_default();
+            let shake_amount = game_settings.fighter_common.visual_shake_table[access_index] * shake_amount * shake_multiplier;
-            let shake_amount = game_settings.fighter_common.visual_shake_table[access_index]
-                * shake_amount
-                * shake_multiplier;
 
             let shake_offset = match hitstop_shake.kind {
                 super::FighterHitstopShakeKind::Horizontal => Vec3::new(shake_amount, 0.0, 0.0),

src/fighter/state/air.rs

@@ -1,3 +1,4 @@
+use crate::fighter::state::ground::GroundedStateCommon;
 use crate::fighter::state::land::{LandingState, LandingType};
 use crate::fighter::state::{CollisionContext, FighterState};
 use crate::fighter::*;
@@ -29,7 +30,7 @@ pub fn process_fast_fall(
 pub fn integrate_gravity(
     velocity: &mut FighterVelocity,
     attributes: &FighterAttributes,
-    fast_fall: bool,
+    fast_fall: bool
 ) {
     velocity.y -= attributes.gravity;
 
@@ -83,9 +84,7 @@ pub fn apply_air_motion(
     velocity: &FighterVelocity,
     translation: &mut FighterTranslation,
     prev_translation: &mut FighterPreviousTranslation,
-    surface: &mut FighterSurfaceState,
 ) {
-    surface.leave_ground();
     // Vertical velocity should be 0 on the ground
     prev_translation.0 = translation.0;
     translation.0 += velocity.0;
@@ -95,24 +94,10 @@ pub fn update_standard_motion(
     ctx: &mut crate::fighter::state::UpdateContext,
     airborne_common: &mut AirborneStateCommon,
 ) {
-    process_fast_fall(
+    process_fast_fall(airborne_common, ctx.input, &mut ctx.velocity, ctx.fighter_attributes);
-        airborne_common,
+    integrate_gravity(ctx.velocity, ctx.fighter_attributes, airborne_common.is_fast_falling);
-        ctx.input,
-        &mut ctx.velocity,
-        ctx.fighter_attributes,
-    );
-    integrate_gravity(
-        ctx.velocity,
-        ctx.fighter_attributes,
-        airborne_common.is_fast_falling,
-    );
     apply_air_drift(ctx.velocity, ctx.fighter_attributes, ctx.input);
-    apply_air_motion(
+    apply_air_motion(ctx.velocity, ctx.translation, ctx.prev_translation);
-        ctx.velocity,
-        ctx.translation,
-        ctx.prev_translation,
-        ctx.surface,
-    );
 }
 
 pub fn collision_interrupt(
@@ -121,8 +106,13 @@ pub fn collision_interrupt(
 ) -> Option<FighterState> {
     let res = ctx.air_collide_with_stage()?;
     ctx.translation.0 = res.hit_position - ctx.ecb.get_bottom_point();
-    ctx.surface.land(res.line_id);
+    let grounded_common = GroundedStateCommon {
-    Some(FighterState::Land(LandingState::create(landing_type)))
+        current_line_id: res.line_id,
+    };
+    Some(FighterState::Land(LandingState::create(
+        grounded_common,
+        landing_type,
+    )))
 }
 
 #[cfg(test)]

src/fighter/state/air_dodge.rs

@@ -1,16 +1,9 @@
 use crate::{
     fighter::{
-        animation::AnimKind,
+        animation::AnimKind, state::{
-        state::{
+            CollisionContext, EnterContext, FighterState, FighterStateImpl, InterruptContext, UpdateContext, air::{self, AirborneStateCommon}, fall::FallState, land::LandingType,
-            CollisionContext, EnterContext, FighterState, FighterStateImpl, InterruptContext,
-            UpdateContext,
-            air::{self, AirborneStateCommon},
-            fall::FallState,
-            land::LandingType,
         },
-    },
+    }, input, math::vec::FGVec2,
-    input,
-    math::vec::FGVec2,
 };
 
 #[derive(Debug, Clone, Hash)]
@@ -23,9 +16,7 @@ impl FighterStateImpl for AirDodgeState {
 
     fn check_interrupt(&self, state_context: &mut InterruptContext) -> Option<FighterState> {
         if state_context.is_current_animation_finished() {
-            Some(FighterState::Fall(FallState::new(
+            Some(FighterState::Fall(FallState::new(AirborneStateCommon::default())))
-                AirborneStateCommon::default(),
-            )))
         } else {
             None
         }
@@ -38,7 +29,6 @@ impl FighterStateImpl for AirDodgeState {
             state_context.velocity,
             state_context.translation,
             state_context.prev_translation,
-            state_context.surface,
         );
     }
 
@@ -55,8 +45,10 @@ impl FighterStateImpl for AirDodgeState {
         state_context.velocity.0 =
             self.direction * state_context.fighter_attributes.air_dodge_velocity;
     }
-
+    
-    fn is_visually_grounded<'a>(&'a self) -> bool {
+    fn is_visually_grounded<'a>(
+        &'a self,
+    ) -> bool {
         false
     }
 }

src/fighter/state/dash.rs

@@ -5,43 +5,52 @@ use super::{
 use crate::fighter::FighterFacingDirection;
 use crate::fighter::animation::AnimKind;
 use crate::fighter::state::FighterState;
+use crate::fighter::state::ground::GroundedStateCommon;
 use crate::input::FighterCommands::{SmashMoveLeft, SmashMoveRight};
 
 #[derive(Debug, Clone, Hash)]
 pub struct DashState {
     direction: FighterFacingDirection,
+    pub ground_common: GroundedStateCommon,
 }
 
 impl DashState {
-    pub fn new(direction: FighterFacingDirection) -> Self {
+    pub fn new(direction: FighterFacingDirection, ground_common: GroundedStateCommon) -> Self {
-        Self { direction }
+        Self {
+            direction,
+            ground_common,
+        }
     }
 }
 
 impl FighterStateImpl for DashState {
     const NAME: &'static str = "Dash";
     fn check_interrupt(&self, ctx: &mut InterruptContext) -> Option<FighterState> {
+        let ground = &self.ground_common;
         let attributes = ctx.fighter_attributes;
 
         // A reverse dash can interrupt before IASA
         if let Some(direction) =
             check_smash_input_with_dir(ctx).filter(|direction| *direction != self.direction)
         {
-            return Some(FighterState::Dash(DashState::new(direction)));
+            return Some(FighterState::Dash(DashState::new(
+                direction,
+                ground.clone(),
+            )));
         }
 
-        if let Some(state) = ground::grounded_movement_common_interrupts(ctx) {
+        if let Some(state) = ground::grounded_movement_common_interrupts(ctx, ground) {
             return Some(state);
         }
 
         if ctx.is_current_animation_finished() {
-            return run::check_input(ctx)
+            return run::check_input(ctx, ground)
-                .or_else(|| walk::check_input(ctx))
+                .or_else(|| walk::check_input(ctx, ground))
-                .or_else(|| wait::check_input(ctx));
+                .or_else(|| wait::check_input(ctx, ground));
         }
 
         if ctx.get_current_animation_frame() > attributes.dash_acceleration_duration {
-            return run::check_input(ctx);
+            return run::check_input(ctx, ground);
         }
 
         None
@@ -97,10 +106,12 @@ impl FighterStateImpl for DashState {
         &mut self,
         state_context: &mut CollisionContext,
     ) -> Option<FighterState> {
-        ground::collision_interrupt(state_context, true)
+        ground::collision_interrupt(state_context, &mut self.ground_common, true)
     }
-
+    
-    fn is_visually_grounded<'a>(&'a self) -> bool {
+    fn is_visually_grounded<'a>(
+        &'a self,
+    ) -> bool {
         true
     }
 }
@@ -115,6 +126,10 @@ fn check_smash_input_with_dir(state_context: &InterruptContext) -> Option<Fighte
     }
 }
 
-pub fn check_input(state_context: &InterruptContext) -> Option<FighterState> {
+pub fn check_input(
-    check_smash_input_with_dir(state_context).map(|dir| FighterState::Dash(DashState::new(dir)))
+    state_context: &InterruptContext,
+    ground_common: &GroundedStateCommon,
+) -> Option<FighterState> {
+    check_smash_input_with_dir(state_context)
+        .map(|dir| FighterState::Dash(DashState::new(dir, ground_common.clone())))
 }

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,
+    CollisionContext, FighterState, InterruptContext, air, dash, fall, ground_attack, turn, wait, walk,
-    walk,
 };
 use crate::fighter::{
     FighterAttributes, FighterPreviousTranslation, FighterTranslation, FighterVelocity,
@@ -14,6 +13,13 @@ use crate::math::int::{FGWide, FGi32};
 use crate::math::vec::FGVec2;
 use crate::stage::line::{StageLineID, StagePoly, StagePolyLineSegment, StagePolyLineSegmentType};
 
+use bevy::prelude::*;
+
+#[derive(Reflect, Hash, Clone, Debug)]
+pub struct GroundedStateCommon {
+    pub current_line_id: StageLineID,
+}
+
 pub fn apply_grounded_friction(friction: FGi32, ground_vel: FGi32) -> FGi32 {
     if friction.abs() > ground_vel.abs() {
         -ground_vel
@@ -175,23 +181,22 @@ pub fn update_friction_motion(ctx: &mut crate::fighter::state::UpdateContext) {
 
 pub fn collide_with_stage_grounded(
     state_context: &mut CollisionContext,
+    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 Some(current_line_id) = state_context.surface.line_id() else {
+    let stage_poly = stage_collision
-        return GroundedMotionResult::InAir;
+        .stage_polys
-    };
+        .get(ground_common.current_line_id.polygon);
-
-    let stage_poly = stage_collision.stage_polys.get(current_line_id.polygon);
 
     if let Some(stage_poly) = stage_poly {
         let ecb_bottom_pos = translation.0 + ecb.get_bottom_point();
         match resolve_grounded_position(
             stage_poly,
-            current_line_id.segment,
+            ground_common.current_line_id.segment,
             ecb_bottom_pos,
             can_walk_off,
         ) {
@@ -211,37 +216,30 @@ pub fn collide_with_stage_grounded(
                             .0
                             .project_onto_normalized(current_segment.normal)
                 };
-                state_context.surface.land(StageLineID {
+                ground_common.current_line_id.segment = segment_idx;
-                    polygon: current_line_id.polygon,
-                    segment: segment_idx,
-                });
                 GroundedMotionResult::InGround
             }
-            GroundedPositionResult::InAir => {
+            GroundedPositionResult::InAir => GroundedMotionResult::InAir,
-                state_context.surface.leave_ground();
-                GroundedMotionResult::InAir
-            }
         }
     } else {
-        state_context.surface.leave_ground();
         GroundedMotionResult::InAir
     }
 }
 
-pub fn collision_interrupt(ctx: &mut CollisionContext, can_walk_off: bool) -> Option<FighterState> {
+pub fn collision_interrupt(
-    match collide_with_stage_grounded(ctx, can_walk_off) {
+    ctx: &mut CollisionContext,
+    common: &mut GroundedStateCommon,
+    can_walk_off: bool,
+) -> Option<FighterState> {
+    match collide_with_stage_grounded(ctx, common, can_walk_off) {
         GroundedMotionResult::InGround => None,
-        GroundedMotionResult::InAir => Some(FighterState::Fall(fall::FallState::new(
+        GroundedMotionResult::InAir => Some(FighterState::Fall(fall::FallState::new(air::AirborneStateCommon::default()))),
-            air::AirborneStateCommon::default(),
-        ))),
     }
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::fighter::ecb::FighterPreviousECB;
-    use crate::fighter::{FighterECB, FighterSurfaceState};
     use crate::stage::line::StagePolyType;
 
     fn two_segment_floor() -> StagePoly {
@@ -348,110 +346,28 @@ mod tests {
             GroundedPositionResult::InAir
         ));
     }
-
-    #[test]
-    fn grounded_collision_updates_surface_segment() {
-        let stage_collision = crate::stage::line::StageCollision {
-            stage_polys: vec![two_segment_floor()],
-        };
-        let mut surface = FighterSurfaceState::Grounded {
-            line_id: StageLineID {
-                polygon: 0,
-                segment: 0,
-            },
-        };
-        let mut translation = FighterTranslation(FGVec2::lit("11", "0"));
-        let previous_translation = FighterPreviousTranslation(translation.0);
-        let mut velocity = FighterVelocity::default();
-        let ecb = FighterECB {
-            vertical_half: FGi32::ONE,
-            horizontal_half: FGi32::ONE,
-        };
-        let previous_ecb = FighterPreviousECB::from(ecb);
-        let mut context = CollisionContext {
-            translation: &mut translation,
-            prev_translation: &previous_translation,
-            velocity: &mut velocity,
-            surface: &mut surface,
-            ecb: &ecb,
-            prev_ecb: &previous_ecb,
-            stage_collision: &stage_collision,
-        };
-
-        assert!(matches!(
-            collide_with_stage_grounded(&mut context, true),
-            GroundedMotionResult::InGround
-        ));
-        assert_eq!(
-            surface.line_id(),
-            Some(StageLineID {
-                polygon: 0,
-                segment: 1,
-            })
-        );
-    }
-
-    #[test]
-    fn walking_off_edge_clears_surface_contact() {
-        let stage_collision = crate::stage::line::StageCollision {
-            stage_polys: vec![StagePoly::build(
-                StagePolyType::Platform,
-                &[
-                    (FGVec2::lit("0", "0"), StagePolyLineSegmentType::Floor),
-                    (FGVec2::lit("10", "0"), StagePolyLineSegmentType::Floor),
-                ],
-            )],
-        };
-        let mut surface = FighterSurfaceState::Grounded {
-            line_id: StageLineID {
-                polygon: 0,
-                segment: 0,
-            },
-        };
-        let mut translation = FighterTranslation(FGVec2::lit("11", "0"));
-        let previous_translation = FighterPreviousTranslation(translation.0);
-        let mut velocity = FighterVelocity::default();
-        let ecb = FighterECB {
-            vertical_half: FGi32::ONE,
-            horizontal_half: FGi32::ONE,
-        };
-        let previous_ecb = FighterPreviousECB::from(ecb);
-        let mut context = CollisionContext {
-            translation: &mut translation,
-            prev_translation: &previous_translation,
-            velocity: &mut velocity,
-            surface: &mut surface,
-            ecb: &ecb,
-            prev_ecb: &previous_ecb,
-            stage_collision: &stage_collision,
-        };
-
-        assert!(matches!(
-            collide_with_stage_grounded(&mut context, true),
-            GroundedMotionResult::InAir
-        ));
-        assert_eq!(surface, FighterSurfaceState::Airborne);
-    }
 }
 
 pub fn grounded_movement_common_interrupts(
     state_context: &InterruptContext,
+    ground_common: &GroundedStateCommon,
 ) -> Option<FighterState> {
-    super::jump::check_input(state_context)
+    super::jump::check_input(state_context, ground_common)
 }
 
 pub fn grounded_movement_standstill_common_interrupts(
     state_context: &InterruptContext,
+    ground_common: &GroundedStateCommon,
 ) -> Option<FighterState> {
-    if let Some(state) = ground_attack::check_interrupt(state_context) {
+    if let Some(state) = ground_attack::check_interrupt(state_context, &ground_common) {
         Some(state)
-    } else if let Some(state) = dash::check_input(state_context) {
+    } else if let Some(state) = dash::check_input(state_context, &ground_common) {
         Some(state)
-    } else if let Some(state) = turn::check_input(state_context) {
+    } else if let Some(state) = turn::check_input(state_context, &ground_common) {
         Some(state)
-    } else if let Some(state) = walk::check_input(state_context) {
+    } else if let Some(state) = walk::check_input(state_context, &ground_common) {
         Some(state)
-    } else if let Some(state) = wait::check_input(state_context) {
+    } else if let Some(state) = wait::check_input(state_context, &ground_common) {
         Some(state)
     } else {
         None

src/fighter/state/ground_attack.rs

@@ -2,13 +2,14 @@ use crate::fighter::{
     attack::{AttackKind, update_active_hitbox_list},
     state::{
         CollisionContext, EnterContext, ExitContext, FighterState, FighterStateImpl,
-        InterruptContext, UpdateContext, wait::WaitState,
+        InterruptContext, UpdateContext, ground::GroundedStateCommon, wait::WaitState,
     },
 };
 
 #[derive(Clone, Debug, Hash)]
 pub struct GroundAttackState {
     pub attack_kind: AttackKind,
+    pub grounded_common: GroundedStateCommon,
 }
 
 impl FighterStateImpl for GroundAttackState {
@@ -16,7 +17,9 @@ impl FighterStateImpl for GroundAttackState {
 
     fn check_interrupt(&self, state_context: &mut InterruptContext) -> Option<FighterState> {
         if state_context.is_current_animation_finished() {
-            Some(FighterState::Wait(WaitState))
+            Some(FighterState::Wait(WaitState {
+                grounded_common: self.grounded_common.clone(),
+            }))
         } else {
             None
         }
@@ -50,7 +53,7 @@ impl FighterStateImpl for GroundAttackState {
             active_hitboxes: Vec::new(),
             solved_hitboxes: Vec::new(),
             hit_fighters: Vec::new(),
-            stalled: false,
+            stalled: false
         });
     }
 
@@ -64,13 +67,18 @@ impl FighterStateImpl for GroundAttackState {
     ) -> Option<FighterState> {
         None
     }
-
+    
-    fn is_visually_grounded<'a>(&'a self) -> bool {
+    fn is_visually_grounded<'a>(
+        &'a self,
+    ) -> bool {
         true
     }
 }
 
-pub fn check_interrupt(state_context: &InterruptContext) -> Option<FighterState> {
+pub fn check_interrupt(
+    state_context: &InterruptContext,
+    grounded_common: &GroundedStateCommon,
+) -> Option<FighterState> {
     if state_context
         .input
         .has_command(crate::input::FighterCommands::Attack)
@@ -81,6 +89,7 @@ pub fn check_interrupt(state_context: &InterruptContext) -> Option<FighterState>
             .to_attack_kind_grounded();
         Some(FighterState::GroundAttack(GroundAttackState {
             attack_kind,
+            grounded_common: grounded_common.clone(),
         }))
     } else {
         None

src/fighter/state/hitstun.rs

@@ -7,7 +7,7 @@ use crate::{
             InterruptContext, UpdateContext,
             air::{self, AirborneStateCommon},
             fall::FallState,
-            ground::collision_interrupt,
+            ground::{GroundedStateCommon, collision_interrupt},
             land::LandingType,
             wait::WaitState,
         },
@@ -17,7 +17,7 @@ use crate::{
 
 #[derive(Clone, Debug, Hash)]
 pub enum HitstopStateKind {
-    Grounded,
+    Grounded(GroundedStateCommon),
     Airborne,
 }
 
@@ -43,7 +43,7 @@ impl FighterStateImpl for HitstunState {
 
     fn name(&self) -> String {
         let hitstop_kind = match self.hitstop_kind {
-            HitstopStateKind::Grounded => "Grounded",
+            HitstopStateKind::Grounded(_) => "Grounded",
             HitstopStateKind::Airborne => "Airborne",
         };
 
@@ -58,10 +58,14 @@ impl FighterStateImpl for HitstunState {
     fn check_interrupt(&self, state_context: &mut InterruptContext) -> Option<FighterState> {
         if state_context.get_current_animation_frame() > self.hit_reaction.hitstun_frames {
             match &self.hitstop_kind {
-                HitstopStateKind::Grounded => Some(FighterState::Wait(WaitState)),
+                HitstopStateKind::Grounded(grounded_state_common) => {
-                HitstopStateKind::Airborne => Some(FighterState::Fall(FallState::new(
+                    Some(FighterState::Wait(WaitState {
-                    AirborneStateCommon::default(),
+                        grounded_common: grounded_state_common.clone(),
-                ))),
+                    }))
+                }
+                HitstopStateKind::Airborne => {
+                    Some(FighterState::Fall(FallState::new(AirborneStateCommon::default())))
+                }
             }
         } else {
             None
@@ -81,9 +85,8 @@ impl FighterStateImpl for HitstunState {
         }
 
         match self.hitstop_kind {
-            HitstopStateKind::Grounded => {}
+            HitstopStateKind::Grounded(_) => {}
             HitstopStateKind::Airborne => {
-                ctx.surface.leave_ground();
                 air::integrate_gravity(ctx.velocity, ctx.fighter_attributes, false);
             }
         }
@@ -100,7 +103,7 @@ impl FighterStateImpl for HitstunState {
 
     fn on_enter(&mut self, state_context: &mut EnterContext) {
         let animation = match self.hitstop_kind {
-            HitstopStateKind::Grounded => AnimKind::FlinchGround,
+            HitstopStateKind::Grounded(_) => AnimKind::FlinchGround,
             HitstopStateKind::Airborne => AnimKind::FlinchAir,
         };
         state_context.play_animation(animation, false);
@@ -113,7 +116,9 @@ impl FighterStateImpl for HitstunState {
         state_context: &mut CollisionContext,
     ) -> Option<FighterState> {
         match &mut self.hitstop_kind {
-            HitstopStateKind::Grounded => collision_interrupt(state_context, true),
+            HitstopStateKind::Grounded(grounded_state_common) => {
+                collision_interrupt(state_context, grounded_state_common, true)
+            }
             HitstopStateKind::Airborne => {
                 air::collision_interrupt(state_context, LandingType::Normal)
             }
@@ -122,7 +127,7 @@ impl FighterStateImpl for HitstunState {
 
     fn is_visually_grounded<'a>(&'a self) -> bool {
         match self.hitstop_kind {
-            HitstopStateKind::Grounded => true,
+            HitstopStateKind::Grounded(_) => true,
             HitstopStateKind::Airborne => false,
         }
     }

src/fighter/state/jump.rs

@@ -2,17 +2,10 @@ use bevy::prelude::*;
 
 use crate::{
     fighter::{
-        animation::AnimKind,
+        animation::AnimKind, state::{
-        state::{
+            CollisionContext, EnterContext, FighterState, FighterStateImpl, InterruptContext, UpdateContext, air::{self, AirborneStateCommon}, air_dodge::{self, AirDodgeState}, ground::{self, GroundedStateCommon},
-            CollisionContext, EnterContext, FighterState, FighterStateImpl, InterruptContext,
-            UpdateContext,
-            air::{self, AirborneStateCommon},
-            air_dodge::{self, AirDodgeState},
-            ground,
         },
-    },
+    }, input::FighterCommands, math::{int::FGi32, vec::FGVec2},
-    input::FighterCommands,
-    math::{int::FGi32, vec::FGVec2},
 };
 #[derive(Debug, Hash, Clone, Copy)]
 pub enum JumpType {
@@ -29,12 +22,14 @@ pub struct JumpState {
 
 #[derive(Debug, Clone, Hash)]
 pub struct JumpSquatState {
+    pub grounded_common: GroundedStateCommon,
     pub duration_counter: u32,
 }
 
 impl JumpSquatState {
-    pub fn create() -> Self {
+    pub fn create(grounded_common: GroundedStateCommon) -> Self {
         Self {
+            grounded_common,
             duration_counter: 0,
         }
     }
@@ -74,10 +69,7 @@ impl FighterStateImpl for JumpSquatState {
             } else {
                 JumpType::ShortHop
             };
-            Some(FighterState::Jump(JumpState {
+            Some(FighterState::Jump(JumpState { jump_type, airborne_state_common: AirborneStateCommon::default() }))
-                jump_type,
-                airborne_state_common: AirborneStateCommon::default(),
-            }))
         } else {
             None
         }
@@ -92,15 +84,17 @@ impl FighterStateImpl for JumpSquatState {
         &mut self,
         state_context: &mut CollisionContext,
     ) -> Option<FighterState> {
-        ground::collision_interrupt(state_context, false)
+        ground::collision_interrupt(state_context, &mut self.grounded_common, false)
     }
 
     fn on_enter(&mut self, state_context: &mut EnterContext) {
         state_context.play_animation(AnimKind::JumpSquat, false);
         state_context.input.clear_command(FighterCommands::Jump);
     }
-
+    
-    fn is_visually_grounded<'a>(&'a self) -> bool {
+    fn is_visually_grounded<'a>(
+        &'a self,
+    ) -> bool {
         true
     }
 }
@@ -111,7 +105,7 @@ impl FighterStateImpl for JumpState {
         if state_context.input.has_command(FighterCommands::Jump) {
             Some(FighterState::Jump(JumpState {
                 jump_type: JumpType::DoubleJump,
-                airborne_state_common: AirborneStateCommon::default(),
+                airborne_state_common: AirborneStateCommon::default()
             }))
         } else {
             air_dodge::check_input(state_context)
@@ -182,17 +176,22 @@ impl FighterStateImpl for JumpState {
             crate::fighter::state::land::LandingType::Normal,
         )
     }
-
+    
-    fn is_visually_grounded<'a>(&'a self) -> bool {
+    fn is_visually_grounded<'a>(
+        &'a self,
+    ) -> bool {
         false
     }
 }
 
-pub fn check_input(state_context: &InterruptContext) -> Option<FighterState> {
+pub fn check_input(
+    state_context: &InterruptContext,
+    ground_common: &GroundedStateCommon,
+) -> Option<FighterState> {
     state_context
         .input
         .has_command(FighterCommands::Jump)
-        .then(|| FighterState::JumpSquat(JumpSquatState::create()))
+        .then(|| FighterState::JumpSquat(JumpSquatState::create(ground_common.clone())))
 }
 
 pub fn check_input_double_jump(state_context: &InterruptContext) -> Option<FighterState> {
@@ -202,7 +201,7 @@ pub fn check_input_double_jump(state_context: &InterruptContext) -> Option<Fight
         .then(|| {
             FighterState::Jump(JumpState {
                 jump_type: JumpType::DoubleJump,
-                airborne_state_common: AirborneStateCommon::default(),
+                airborne_state_common: AirborneStateCommon::default()
             })
         })
 }

src/fighter/state/land.rs

@@ -3,7 +3,7 @@ use crate::fighter::{
     state::{
         CollisionContext, EnterContext, FighterState, FighterStateImpl, InterruptContext,
         UpdateContext, dash,
-        ground::{self, grounded_movement_standstill_common_interrupts},
+        ground::{self, GroundedStateCommon, grounded_movement_standstill_common_interrupts},
         walk,
     },
 };
@@ -16,12 +16,16 @@ pub enum LandingType {
 
 #[derive(Debug, Clone, Hash)]
 pub struct LandingState {
+    pub grounded_common: GroundedStateCommon,
     pub landing_type: LandingType,
 }
 
 impl LandingState {
-    pub fn create(landing_type: LandingType) -> Self {
+    pub fn create(grounded_common: GroundedStateCommon, landing_type: LandingType) -> Self {
-        Self { landing_type }
+        Self {
+            grounded_common,
+            landing_type,
+        }
     }
 }
 
@@ -30,14 +34,14 @@ impl FighterStateImpl for LandingState {
 
     fn check_interrupt(&self, state_context: &mut InterruptContext) -> Option<FighterState> {
         if state_context.is_current_animation_finished() {
-            grounded_movement_standstill_common_interrupts(state_context)
+            grounded_movement_standstill_common_interrupts(state_context, &self.grounded_common)
         } else if state_context.get_current_animation_frame()
             >= state_context.fighter_attributes.landing_iasa
             && let LandingType::Normal = self.landing_type
         {
-            dash::check_input(state_context).or_else(|| {
+            dash::check_input(state_context, &self.grounded_common).or_else(|| {
-                ground::grounded_movement_common_interrupts(state_context)
+                ground::grounded_movement_common_interrupts(state_context, &self.grounded_common)
-                    .or_else(|| walk::check_input(state_context))
+                    .or_else(|| walk::check_input(state_context, &self.grounded_common))
             })
         } else {
             None
@@ -52,7 +56,7 @@ impl FighterStateImpl for LandingState {
         &mut self,
         state_context: &mut CollisionContext,
     ) -> Option<FighterState> {
-        ground::collision_interrupt(state_context, true)
+        ground::collision_interrupt(state_context, &mut self.grounded_common, true)
     }
 
     fn on_enter(&mut self, state_context: &mut EnterContext) {
@@ -65,8 +69,10 @@ impl FighterStateImpl for LandingState {
             }
         };
     }
-
+    
-    fn is_visually_grounded<'a>(&'a self) -> bool {
+    fn is_visually_grounded<'a>(
+        &'a self,
+    ) -> bool {
         true
     }
 }

src/fighter/state/mod.rs

@@ -7,8 +7,7 @@ use bevy::prelude::*;
 
 use crate::fighter::animation::{AnimKind, FighterAnimationFrame};
 use crate::fighter::attack::{
-    FighterAttackScriptAssets, FighterKnockbackVelocity, FighterPendingHitReaction,
+    FighterAttackScriptAssets, FighterKnockbackVelocity, FighterPendingHitReaction, FighterStaleMoveQueue, HitStop,
-    FighterStaleMoveQueue, HitStop,
 };
 use crate::fighter::attributes::FighterAttributes;
 use crate::fighter::baked_animation::BakedFighterAnimations;
@@ -17,9 +16,7 @@ use crate::fighter::manifest::FighterManifest;
 use crate::fighter::state::hitstun::HitstunState;
 use crate::fighter::visual::FighterAnimations;
 use crate::fighter::{
-    Fighter, FighterECB, FighterFacingDirection, FighterHitboxes, FighterHitstop,
+    Fighter, FighterECB, FighterFacingDirection, FighterHitboxes, FighterHitstop, FighterHitstopShake, FighterHitstopShakeKind, FighterHitstopShakeRole, FighterPreviousTranslation, FighterTranslation, FighterVelocity,
-    FighterHitstopShake, FighterHitstopShakeKind, FighterHitstopShakeRole,
-    FighterPreviousTranslation, FighterSurfaceState, FighterTranslation, FighterVelocity,
 };
 use crate::game_settings::GameSettings;
 use crate::input::FighterInput;
@@ -98,7 +95,9 @@ pub trait FighterStateImpl: Sized {
         None
     }
 
-    fn is_visually_grounded<'a>(&'a self) -> bool;
+    fn is_visually_grounded<'a>(
+        &'a self,
+    ) -> bool;
 }
 
 pub struct AnimationStatus {
@@ -152,7 +151,6 @@ pub struct UpdateContext<'a> {
     pub input: &'a mut FighterInput,
     pub hitboxes: &'a mut FighterHitboxes,
     pub velocity: &'a mut FighterVelocity,
-    pub surface: &'a mut FighterSurfaceState,
     pub knockback_velocity: &'a mut FighterKnockbackVelocity,
     pub game_settings: &'a GameSettings,
     pub animation_frame: u32,
@@ -172,7 +170,6 @@ pub struct CollisionContext<'a> {
     pub translation: &'a mut FighterTranslation,
     pub prev_translation: &'a FighterPreviousTranslation,
     pub velocity: &'a mut FighterVelocity,
-    pub surface: &'a mut FighterSurfaceState,
     pub ecb: &'a FighterECB,
     pub prev_ecb: &'a FighterPreviousECB,
     pub stage_collision: &'a StageCollision,
@@ -215,7 +212,6 @@ pub struct FighterFrameQuery {
     pub input: &'static mut FighterInput,
     pub hitboxes: &'static mut FighterHitboxes,
     pub velocity: &'static mut FighterVelocity,
-    pub surface: &'static mut FighterSurfaceState,
     pub knockback_velocity: &'static mut FighterKnockbackVelocity,
     pub stale_move_queue: &'static mut FighterStaleMoveQueue,
     pub ecb: &'static FighterECB,
@@ -296,14 +292,13 @@ impl<'w, 's> FighterFrameQueryItem<'w, 's> {
             input: &mut self.input,
             hitboxes: &mut self.hitboxes,
             velocity: &mut self.velocity,
-            surface: &mut self.surface,
             knockback_velocity: &mut self.knockback_velocity,
             game_settings,
             animation_frame: self.animation_frame.frame,
             fighter_attributes: attributes,
             attack_scripts,
             attack_script_assets,
-            facing_direction: &self.facing_direction,
+            facing_direction: &self.facing_direction
         }
     }
 
@@ -315,7 +310,6 @@ impl<'w, 's> FighterFrameQueryItem<'w, 's> {
             translation: &mut self.translation,
             prev_translation: &self.prev_translation,
             velocity: &mut self.velocity,
-            surface: &mut self.surface,
             ecb: &self.ecb,
             prev_ecb: &self.prev_ecb,
             stage_collision,
@@ -406,9 +400,7 @@ pub fn state_interrupt_system(
 
         let new_state = if let Some(reaction) = pending_hit_reaction.take() {
             hitstop.remaining_frames = *reaction.hitstop_frames;
-            let shake_frames = reaction
+            let shake_frames = reaction.hitstop_frames.calculate_shake_frames(&game_settings);
-                .hitstop_frames
-                .calculate_shake_frames(&game_settings);
             hitstop_shake.role = FighterHitstopShakeRole::Receiver;
             hitstop_shake.total_frames = shake_frames;
             hitstop_shake.remaining_frames = shake_frames;
@@ -417,26 +409,36 @@ pub fn state_interrupt_system(
             } else {
                 FighterHitstopShakeKind::Vertical
             };
-
+            
-            let mut hitstop_kind = if frame.surface.is_grounded() {
+            let mut hitstop_kind = match &*state {
-                hitstun::HitstopStateKind::Grounded
+                FighterState::Wait(value) => {
-            } else {
+                    hitstun::HitstopStateKind::Grounded(value.grounded_common.clone())
-                hitstun::HitstopStateKind::Airborne
+                }
+                FighterState::Walk(value) => {
+                    hitstun::HitstopStateKind::Grounded(value.grounded_common.clone())
+                }
+                FighterState::Dash(value) => {
+                    hitstun::HitstopStateKind::Grounded(value.ground_common.clone())
+                }
+                FighterState::Run(value) => {
+                    hitstun::HitstopStateKind::Grounded(value.grounded_common.clone())
+                }
+                FighterState::Turn(value) => {
+                    hitstun::HitstopStateKind::Grounded(value.grounded_common.clone())
+                }
+                FighterState::GroundAttack(value) => {
+                    hitstun::HitstopStateKind::Grounded(value.grounded_common.clone())
+                }
+                _ => hitstun::HitstopStateKind::Airborne,
             };
 
-            if let hitstun::HitstopStateKind::Grounded = hitstop_kind {
+            if let hitstun::HitstopStateKind::Grounded(_) = hitstop_kind {
                 let straight_up_angle = FGi32::lit("90.0");
-                if reaction.hitstop_frames
+                if reaction.hitstop_frames >= HitStop::new(game_settings.fighter_common.tumble_bounce_hitstop_threshold) {
-                    >= HitStop::new(game_settings.fighter_common.tumble_bounce_hitstop_threshold)
-                {
                     hitstop_kind = hitstun::HitstopStateKind::Airborne;
                 // TODO: Use floor normal here
-                } else if reaction.launch_angle.abs_diff(straight_up_angle)
+                } else if reaction.launch_angle.abs_diff(straight_up_angle) < game_settings.fighter_common.attack_ground_to_airborne_transition_vertical_angle_threshold {
-                    < game_settings
+                        hitstop_kind = hitstun::HitstopStateKind::Airborne;
-                        .fighter_common
-                        .attack_ground_to_airborne_transition_vertical_angle_threshold
-                {
-                    hitstop_kind = hitstun::HitstopStateKind::Airborne;
                 } else {
                     // straight down is 270
                     let straight_down_angle = FGi32::lit("270.0");
@@ -448,10 +450,6 @@ pub fn state_interrupt_system(
                 }
             }
 
-            if matches!(hitstop_kind, hitstun::HitstopStateKind::Airborne) {
-                frame.surface.leave_ground();
-            }
-
             info!("Entering hitstop kind: {:?}", hitstop_kind);
             Some(FighterState::Hitstun(HitstunState::new(
                 reaction,

src/fighter/state/run.rs

@@ -6,14 +6,19 @@ use super::{
 };
 use crate::fighter::animation::AnimKind;
 use crate::fighter::state::FighterState;
+use crate::fighter::state::ground::GroundedStateCommon;
 
 #[derive(Component, Debug, Clone, Hash)]
-pub struct RunState;
+pub struct RunState {
+    pub grounded_common: GroundedStateCommon,
+}
 
 impl FighterStateImpl for RunState {
     const NAME: &'static str = "Run";
     fn check_interrupt(&self, state_context: &mut InterruptContext) -> Option<FighterState> {
-        if let Some(state) = ground::grounded_movement_common_interrupts(state_context) {
+        if let Some(state) =
+            ground::grounded_movement_common_interrupts(state_context, &self.grounded_common)
+        {
             return Some(state);
         }
 
@@ -23,7 +28,8 @@ impl FighterStateImpl for RunState {
         {
             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))
         }
     }
 
@@ -56,19 +62,26 @@ impl FighterStateImpl for RunState {
         &mut self,
         state_context: &mut CollisionContext,
     ) -> Option<FighterState> {
-        ground::collision_interrupt(state_context, true)
+        ground::collision_interrupt(state_context, &mut self.grounded_common, true)
     }
-
+    
-    fn is_visually_grounded<'a>(&'a self) -> bool {
+    fn is_visually_grounded<'a>(
+        &'a self,
+    ) -> bool {
         true
     }
 }
 
-pub fn check_input(state_context: &InterruptContext) -> Option<FighterState> {
+pub fn check_input(
+    state_context: &InterruptContext,
+    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));
+        return Some(FighterState::Run(RunState {
+            grounded_common: ground_state_common.clone(),
+        }));
     }
     None
 }

src/fighter/state/turn.rs

@@ -1,11 +1,13 @@
 use super::{CollisionContext, EnterContext, FighterStateImpl, InterruptContext, UpdateContext};
 use crate::fighter::animation::AnimKind;
-use crate::fighter::state::ground;
+use crate::fighter::state::ground::{self, GroundedStateCommon};
 use crate::fighter::state::{FighterState, dash, jump, wait, walk};
 use crate::input::FighterCommands;
 
 #[derive(Debug, Clone, Hash)]
-pub struct TurnState;
+pub struct TurnState {
+    pub grounded_common: GroundedStateCommon,
+}
 
 impl FighterStateImpl for TurnState {
     const NAME: &'static str = "Turn";
@@ -17,19 +19,19 @@ impl FighterStateImpl for TurnState {
                 .input_common
                 .turn_into_dashback_window as u32
         {
-            if let Some(state) = dash::check_input(state_context) {
+            if let Some(state) = dash::check_input(state_context, &self.grounded_common) {
                 return Some(state);
             }
         }
-        if let Some(state) = jump::check_input(state_context) {
+        if let Some(state) = jump::check_input(state_context, &self.grounded_common) {
             *state_context.facing_direction = state_context.facing_direction.reverse();
             Some(state)
         } else if state_context.is_current_animation_finished() {
-            if let Some(state) = dash::check_input(state_context) {
+            if let Some(state) = dash::check_input(state_context, &self.grounded_common) {
                 Some(state)
-            } else if let Some(state) = walk::check_input(state_context) {
+            } else if let Some(state) = walk::check_input(state_context, &self.grounded_common) {
                 Some(state)
-            } else if let Some(state) = wait::check_input(state_context) {
+            } else if let Some(state) = wait::check_input(state_context, &self.grounded_common) {
                 Some(state)
             } else {
                 None
@@ -52,15 +54,20 @@ impl FighterStateImpl for TurnState {
         &mut self,
         state_context: &mut CollisionContext,
     ) -> Option<FighterState> {
-        ground::collision_interrupt(state_context, false)
+        ground::collision_interrupt(state_context, &mut self.grounded_common, false)
     }
-
+    
-    fn is_visually_grounded<'a>(&'a self) -> bool {
+    fn is_visually_grounded<'a>(
+        &'a self,
+    ) -> bool {
         true
     }
 }
 
-pub fn check_input(state_context: &InterruptContext) -> Option<FighterState> {
+pub fn check_input(
+    state_context: &InterruptContext,
+    grounded_common: &GroundedStateCommon,
+) -> Option<FighterState> {
     let input_frame = state_context.input.get_last_frame();
 
     let has_smash_input = state_context
@@ -74,7 +81,9 @@ pub fn check_input(state_context: &InterruptContext) -> Option<FighterState> {
         && input_frame.movement.x.signum() != state_context.facing_direction.to_sign()
         && !has_smash_input
     {
-        return Some(FighterState::Turn(TurnState));
+        return Some(FighterState::Turn(TurnState {
+            grounded_common: grounded_common.clone(),
+        }));
     }
     None
 }

src/fighter/state/wait.rs

@@ -3,18 +3,24 @@ use super::{
 };
 use crate::fighter::animation::AnimKind;
 use crate::fighter::state::FighterState;
+use crate::fighter::state::ground::GroundedStateCommon;
 
 #[derive(Debug, Clone, Hash)]
-pub struct WaitState;
+pub struct WaitState {
+    pub grounded_common: GroundedStateCommon,
+}
 
 impl FighterStateImpl for WaitState {
     const NAME: &'static str = "Wait";
     fn check_interrupt(&self, state_context: &mut InterruptContext) -> Option<FighterState> {
-        if let Some(state) = ground::grounded_movement_common_interrupts(state_context) {
+        if let Some(state) =
-            Some(state)
+            ground::grounded_movement_common_interrupts(state_context, &self.grounded_common)
-        } else if let Some(state) =
-            ground::grounded_movement_standstill_common_interrupts(state_context)
         {
+            Some(state)
+        } else if let Some(state) = ground::grounded_movement_standstill_common_interrupts(
+            state_context,
+            &self.grounded_common,
+        ) {
             // Don't transition into yourself
             if let FighterState::Wait(_) = state {
                 None
@@ -38,19 +44,26 @@ impl FighterStateImpl for WaitState {
         &mut self,
         state_context: &mut CollisionContext,
     ) -> Option<FighterState> {
-        ground::collision_interrupt(state_context, false)
+        ground::collision_interrupt(state_context, &mut self.grounded_common, false)
     }
-
+    
-    fn is_visually_grounded<'a>(&'a self) -> bool {
+    fn is_visually_grounded<'a>(
+        &'a self,
+    ) -> bool {
         true
     }
 }
 
-pub fn check_input(state_context: &InterruptContext) -> Option<FighterState> {
+pub fn check_input(
+    state_context: &InterruptContext,
+    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(FighterState::Wait(WaitState));
+        return Some(FighterState::Wait(WaitState {
+            grounded_common: ground_state_common.clone(),
+        }));
     }
     None
 }

src/fighter/state/walk.rs

@@ -4,17 +4,23 @@ use super::{
 };
 use crate::fighter::animation::AnimKind;
 use crate::fighter::state::FighterState;
+use crate::fighter::state::ground::GroundedStateCommon;
 
 #[derive(Debug, Clone, Hash)]
-pub struct WalkState;
+pub struct WalkState {
+    pub grounded_common: GroundedStateCommon,
+}
 
 impl FighterStateImpl for WalkState {
     const NAME: &'static str = "Walk";
     fn check_interrupt(&self, state_context: &mut InterruptContext) -> Option<FighterState> {
-        if let Some(state) = ground::grounded_movement_common_interrupts(state_context) {
+        if let Some(state) =
+            ground::grounded_movement_common_interrupts(state_context, &self.grounded_common)
+        {
             return Some(state);
         }
-        wait::check_input(state_context).or_else(|| dash::check_input(state_context))
+        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 EnterContext) {
@@ -48,19 +54,26 @@ impl FighterStateImpl for WalkState {
         &mut self,
         state_context: &mut CollisionContext,
     ) -> Option<FighterState> {
-        ground::collision_interrupt(state_context, false)
+        ground::collision_interrupt(state_context, &mut self.grounded_common, false)
     }
-
+    
-    fn is_visually_grounded<'a>(&'a self) -> bool {
+    fn is_visually_grounded<'a>(
+        &'a self,
+    ) -> bool {
         true
     }
 }
 
-pub fn check_input(state_context: &InterruptContext) -> Option<FighterState> {
+pub fn check_input(
+    state_context: &InterruptContext,
+    ground_state_common: &GroundedStateCommon,
+) -> Option<FighterState> {
     let input_frame = state_context.input.get_last_frame();
 
     if !input_frame.movement.x.is_zero() {
-        return Some(FighterState::Walk(WalkState));
+        return Some(FighterState::Walk(WalkState {
+            grounded_common: ground_state_common.clone(),
+        }));
     }
 
     None

src/fighter/surface.rs

@@ -1,62 +0,0 @@
-use bevy::prelude::*;
-
-use crate::stage::line::StageLineID;
-
-/// The stage surface currently supporting a fighter.
-///
-/// This is physics state rather than fighter-state-machine state. Keeping it
-/// separate means grounded, landing, and hitstun states all share one source
-/// of truth for stage contact.
-#[derive(Component, Clone, Copy, Debug, Default, Hash, PartialEq, Eq)]
-pub enum FighterSurfaceState {
-    #[default]
-    Airborne,
-    Grounded {
-        line_id: StageLineID,
-    },
-}
-
-impl FighterSurfaceState {
-    pub fn is_grounded(self) -> bool {
-        matches!(self, Self::Grounded { .. })
-    }
-
-    pub fn line_id(self) -> Option<StageLineID> {
-        match self {
-            Self::Airborne => None,
-            Self::Grounded { line_id } => Some(line_id),
-        }
-    }
-
-    pub(crate) fn land(&mut self, line_id: StageLineID) {
-        *self = Self::Grounded { line_id };
-    }
-
-    pub(crate) fn leave_ground(&mut self) {
-        *self = Self::Airborne;
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn contact_lifecycle_has_one_source_of_truth() {
-        let mut surface = FighterSurfaceState::default();
-        assert!(!surface.is_grounded());
-        assert_eq!(surface.line_id(), None);
-
-        let line_id = StageLineID {
-            polygon: 2,
-            segment: 3,
-        };
-        surface.land(line_id);
-        assert!(surface.is_grounded());
-        assert_eq!(surface.line_id(), Some(line_id));
-
-        surface.leave_ground();
-        assert!(!surface.is_grounded());
-        assert_eq!(surface.line_id(), None);
-    }
-}

src/stage/line.rs

@@ -26,7 +26,7 @@ pub enum StagePolyType {
     Platform,
 }
 
-#[derive(Reflect, Hash, Debug, Clone, Copy, Default, PartialEq, Eq)]
+#[derive(Reflect, Hash, Debug, Clone, Copy, Default)]
 pub struct StageLineID {
     pub polygon: usize,
     pub segment: usize,