Initial work on ledge & improved baking of root motion. (#90)

Reviewed-on: #90
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/fighter/collision.rs

@@ -2,9 +2,10 @@
 
 use crate::fighter::ecb::FighterPreviousECB;
 use crate::fighter::{FighterECB, FighterPreviousTranslation, FighterTranslation};
+use crate::math::rect::FGRect;
 use crate::math::segment::FGSegment2d;
 use crate::math::vec::FGVec2;
-use crate::stage::line::{StageCollision, StageLineID, StagePolyType};
+use crate::stage::line::{StageCollision, StageLineID, StagePolyType, StageVertexID};
 /*
 pub fn collide_fighter_with_scene(
     fighters: Query<(&FighterECB, &mut FighterVelocity, &mut FighterTranslation)>,
@@ -83,6 +84,20 @@ pub fn air_collide_with_stage(
         .map(|(result, _)| result)
 }
 
+#[derive(Clone)]
+pub struct AirCollisionWithLedgeResult {
+    pub ledge: StageVertexID,
+}
+
+pub fn air_collide_with_ledges(
+    ledge_box: &FGRect,
+    stage_collision: &StageCollision,
+) -> Option<AirCollisionWithLedgeResult> {
+    stage_collision.intersect_ledges(ledge_box).map(|result| {
+        AirCollisionWithLedgeResult { ledge: result.vertex_id }
+    })
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -115,6 +130,7 @@ mod tests {
     fn airborne_collision_skips_ignored_polygons() {
         let stage_collision = StageCollision {
             stage_polys: vec![horizontal_platform("0"), horizontal_platform("1")],
+            ..StageCollision::default()
         };
         let previous_translation = FighterPreviousTranslation(FGVec2::lit("0", "2"));
         let translation = FighterTranslation(FGVec2::lit("0", "-1"));
@@ -150,6 +166,7 @@ mod tests {
     fn airborne_collision_skips_soft_platforms_while_passing_down() {
         let stage_collision = StageCollision {
             stage_polys: vec![horizontal_platform("0")],
+            ..StageCollision::default()
         };
         let previous_translation = FighterPreviousTranslation(FGVec2::lit("0", "2"));
         let translation = FighterTranslation(FGVec2::lit("0", "-1"));
@@ -197,6 +214,7 @@ mod tests {
     fn airborne_collision_still_hits_solid_floors_while_passing_down() {
         let stage_collision = StageCollision {
             stage_polys: vec![solid_floor()],
+            ..StageCollision::default()
         };
         let previous_translation = FighterPreviousTranslation(FGVec2::lit("0", "2"));
         let translation = FighterTranslation(FGVec2::lit("0", "-1"));