From 3be37740f7dbf3c58f1c1ec0c811ea200cd996ce Mon Sep 17 00:00:00 2001
From: Colin McMillen <colin@semicolin.games>
Date: Tue, 24 Mar 2020 13:57:15 -0400
Subject: [PATCH] Geometry: add equality operators & GetHashCode for structs

---
 Shared/Geometry.cs | 49 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/Shared/Geometry.cs b/Shared/Geometry.cs
index 98ff0fb..4abd3f4 100644
--- a/Shared/Geometry.cs
+++ b/Shared/Geometry.cs
@@ -66,6 +66,23 @@ namespace SemiColinGames {
       Normal = normal;
       Time = time;
     }
+
+    public static bool operator ==(Hit a, Hit b) {
+      return a.Position == b.Position && a.Delta == b.Delta && a.Normal == b.Normal
+          && a.Time == b.Time && a.Collider == b.Collider;
+    }
+
+    public static bool operator !=(Hit a, Hit b) {
+      return !(a == b);
+    }
+
+    public override bool Equals(object o) {
+      return o is Hit h && this == h;
+    }
+
+    public override int GetHashCode() {
+      return (Collider, Position, Delta, Normal, Time).GetHashCode();
+    }
   }
 
   public readonly struct Sweep {
@@ -78,6 +95,22 @@ namespace SemiColinGames {
       Position = position;
       Time = time;
     }
+
+    public static bool operator ==(Sweep a, Sweep b) {
+      return a.Hit == b.Hit && a.Position == b.Position && a.Time == b.Time;
+    }
+
+    public static bool operator !=(Sweep a, Sweep b) {
+      return !(a == b);
+    }
+
+    public override bool Equals(object o) {
+      return o is Sweep s && this == s;
+    }
+
+    public override int GetHashCode() {
+      return (Hit, Position, Time).GetHashCode();
+    }
   }
 
   public readonly struct AABB {
@@ -94,6 +127,22 @@ namespace SemiColinGames {
       Tile = tile;
     }
 
+    public static bool operator ==(AABB a, AABB b) {
+      return a.Position == b.Position && a.HalfSize == b.HalfSize && a.Tile == b.Tile;
+    }
+
+    public static bool operator !=(AABB a, AABB b) {
+      return !(a == b);
+    }
+
+    public override bool Equals(object o) {
+      return o is AABB a && this == a;
+    }
+
+    public override int GetHashCode() {
+      return (Position, HalfSize, Tile).GetHashCode();
+    }
+
     public float Top {
       get { return Position.Y - HalfSize.Y; }
     }