remove enemyTree (quad tree holding enemies) from game type as this is not static geometry and, since enemies are moving every frame, this should also be regenerated on every frame

fcore/game-type.sml

@@ -70,7 +70,6 @@ sig
     , platforms: platform vector
     , platformTree: QuadTree.t
     , enemies: enemy vector
-    , enemyTree: QuadTree.t
     }
 
   val initial: game_type
@@ -149,7 +148,6 @@ struct
     , platforms: platform vector
     , platformTree: QuadTree.t
     , enemies: enemy vector
-    , enemyTree: QuadTree.t
     }
 
   val initial: game_type =
@@ -185,7 +183,6 @@ struct
       val enemy2 = {id = 2, x = 555, y = 945, health = 5}
       val enemy3 = {id = 3, x = 979, y = 945, health = 5}
       val enemies = Vector.fromList [enemy1, enemy2, enemy3]
-      val enemyTree = Enemy.generateTree enemies
     in
       { player = player
       , walls = walls
@@ -193,7 +190,6 @@ struct
       , platforms = platforms
       , platformTree = platformTree
       , enemies = enemies
-      , enemyTree = enemyTree
       }
     end
 end

fcore/game-update.sml

@@ -2,16 +2,16 @@ structure GameUpdate =
 struct
   fun update (game, input) =
     let
-      val {player, walls, wallTree, platforms, platformTree, enemies, enemyTree} =
-        game
+      val {player, walls, wallTree, platforms, platformTree, enemies} = game
 
       val player = Player.runPhysicsAndInput (game, input)
 
+      val enemyTree = Enemy.generateTree enemies
+
       (* check player-enemy collisions and react *)
       val (player, enemies, enemyTree) =
         PlayerEnemy.checkCollisions
           (player, enemies, enemyTree, #projectiles player)
-
     in
       { player = player
       , walls = walls
@@ -19,7 +19,6 @@ struct
       , platforms = platforms
       , platformTree = platformTree
       , enemies = enemies
-      , enemyTree = enemyTree
       }
     end
 end

fcore/player.sml

@@ -422,7 +422,7 @@ struct
   (* only checks for collisions with environment (walls and platforms) *)
   fun getEnvironmentPatches (player, game) =
     let
-      val {walls, wallTree, platformTree, platforms, enemyTree, enemies, ...} =
+      val {walls, wallTree, platformTree, platforms, enemies, ...} =
         game
 
       val {x, y, attacked, mainAttack, ...} = player