Implement animation root motion deltas (#84)

Implements root motion and adds a dash attack.

Reviewed-on: #84
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/fighter/state/mod.rs

@@ -11,7 +11,7 @@ use crate::fighter::attack::{
     FighterStaleMoveQueue, HitStop,
 };
 use crate::fighter::attributes::FighterAttributes;
-use crate::fighter::baked_animation::BakedFighterAnimations;
+use crate::fighter::baked_animation::{BakedFighterAnimations, FighterBoneMatrices};
 use crate::fighter::ecb::FighterPreviousECB;
 use crate::fighter::manifest::FighterManifest;
 use crate::fighter::state::hitstun::HitstunState;
@@ -29,6 +29,7 @@ use crate::match_loading::MatchConfig;
 use crate::match_runtime::MatchState;
 use crate::math::int::FGi32;
 use crate::math::vec::FGVec2;
+use crate::math::vec3::FGVec3;
 use crate::player::Player;
 use crate::scripting::FighterAttackScript;
 use crate::stage::line::StageCollision;
@@ -191,6 +192,9 @@ pub struct UpdateContext<'a> {
     pub knockback_velocity: &'a mut FighterKnockbackVelocity,
     pub vulnerability: &'a mut FighterInvulnerabilityState,
     pub game_settings: &'a GameSettings,
+    /// Root motion in the fighter's gameplay plane: X is world-right and Y is
+    /// world-up. Animation +Z is forward and is mirrored by facing direction.
+    pub animation_root_motion_delta: FGVec2,
     pub animation_frame: u32,
     pub fighter_attributes: &'a FighterAttributes,
     pub attack_scripts: &'a Assets<FighterAttackScript>,
@@ -198,6 +202,13 @@ pub struct UpdateContext<'a> {
     pub facing_direction: &'a FighterFacingDirection,
 }
 
+fn animation_root_motion_to_gameplay(
+    delta: FGVec3,
+    facing_direction: &FighterFacingDirection,
+) -> FGVec2 {
+    FGVec2::new(delta.z * facing_direction.to_sign(), delta.y)
+}
+
 impl UpdateContext<'_> {
     pub fn get_current_animation_frame(&self) -> u32 {
         self.animation_frame
@@ -275,6 +286,7 @@ pub struct FighterFrameQuery {
     pub animation_frame: &'static mut FighterAnimationFrame,
     pub vulnerability: &'static mut FighterInvulnerabilityState,
     pub fighter: &'static Fighter,
+    pub bone_matrices: &'static FighterBoneMatrices,
 }
 
 impl<'w, 's> FighterFrameQueryItem<'w, 's> {
@@ -365,6 +377,10 @@ impl<'w, 's> FighterFrameQueryItem<'w, 's> {
             surface: &mut self.surface,
             knockback_velocity: &mut self.knockback_velocity,
             game_settings,
+            animation_root_motion_delta: animation_root_motion_to_gameplay(
+                self.bone_matrices.root_motion_delta(),
+                &self.facing_direction,
+            ),
             animation_frame: self.animation_frame.frame,
             vulnerability: &mut self.vulnerability,
             fighter_attributes: attributes,