enemy movement and object pool

game/enemy.odin

@@ -1,29 +1,77 @@
 package game
 
 Enemy :: struct {
-	position: Vec2,
-	health:   int,
-	active:   bool,
-	speed:    f32,
+	position:   Vec2,
+	health:     int,
+	max_health: int,
+	active:     bool,
+	path_index: int,
+	speed:      f32,
 }
 
-spawn_enemy :: proc(world: ^World) {
+acquire_enemy :: proc(world: ^World) -> ^Enemy {
+	// create an object pool with fixed slots to reuse instead of allocate/free every spawn
+	for i in 0 ..< MAX_ENEMIES {
+		if !world.enemies[i].active {
+			return &world.enemies[i]
+		}
+	}
+
+	return nil
+}
+
+spawn_enemy :: proc(world: ^World, health: int, speed: f32) {
 	if len(world.path) == 0 do return // don't spawn enemies if no paths exist
 
-	world.enemy = Enemy {
-		position = world.path[0],
-		health   = 40,
-		speed    = 60,
-		active   = true,
+	e := acquire_enemy(world) // grab a free slot
+	if e == nil do return // if there are no slots, skil spawning
+
+	e^ = Enemy {
+		position   = world.path[0],
+		health     = health,
+		max_health = health,
+		speed      = speed,
+		path_index = 1,
+		active     = true,
 	}
 }
 
-update_enemy :: proc(world: ^World, dt: f32) {
-	e := &world.enemy
-	if !e.active do return
-	if len(world.path) == 0 do return
-
-	target := world.path[len(world.path) - 1]
-	move_toward(&e.position, target, e.speed, dt)
+spawn_group :: proc(world: ^World, count: int) {
+	for _ in 0 ..< count {
+		spawn_enemy(world, 20, 60)
+	}
+}
+
+update_enemies :: proc(world: ^World, dt: f32) {
+	for i in 0 ..< MAX_ENEMIES {
+		e := &world.enemies[i]
+		if !e.active do continue
+
+		if len(world.path) == 2 do return
+
+		if e.path_index >= len(world.path) {
+			world.base_health -= 1
+			e.active = false
+			continue
+		}
+
+		target := world.path[e.path_index]
+		move_toward(&e.position, target, e.speed, dt)
+
+		dx := target.x - e.position.x
+		dy := target.y - e.position.y
+		if dx * dx + dy * dy < 16.0 {
+			e.path_index += 1
+		}
+	}
+}
+
+active_enemy_count :: proc(world: ^World) -> int {
+	count := 0
+	for i in 0 ..< MAX_ENEMIES {
+		if world.enemies[i].active do count += 1
+	}
+
+	return count
 }