From 756df27fd6bd58a4938537dcaa8b7a12bef48c63 Mon Sep 17 00:00:00 2001
From: Karn Kaul <karnkaul@gmail.com>
Date: Wed, 26 Jun 2024 00:32:59 +0530
Subject: [PATCH] Make `SpawnTimer` polymorphic, store vector.

---
 src/spaced/spaced/scenes/endless.cpp |  9 +++++++--
 src/spaced/spaced/scenes/endless.hpp | 13 +++++++++----
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/src/spaced/spaced/scenes/endless.cpp b/src/spaced/spaced/scenes/endless.cpp
index 808fda0..3281fcd 100644
--- a/src/spaced/spaced/scenes/endless.cpp
+++ b/src/spaced/spaced/scenes/endless.cpp
@@ -1,4 +1,5 @@
 #include <bave/core/random.hpp>
+#include <spaced/game/enemies/creep.hpp>
 #include <spaced/game/powerups/beam.hpp>
 #include <spaced/scenes/endless.hpp>
 #include <spaced/services/game_signals.hpp>
@@ -9,10 +10,12 @@ using bave::random_in_range;
 using bave::Seconds;
 using bave::Services;
 
-EndlessScene::EndlessScene(App& app, Services const& services) : GameScene(app, services), m_creeps{.services = &services} {
+EndlessScene::EndlessScene(App& app, Services const& services) : GameScene(app, services) {
 	m_on_player_scored = services.get<GameSignals>().player_scored.connect([this](Enemy const& e) {
 		if (random_in_range(0, 10) < 3) { debug_spawn_powerup(e.get_position()); }
 	});
+
+	m_spawn_timers.push_back(std::make_unique<SpawnTimer<enemy::Creep>>(&services));
 }
 
 void EndlessScene::tick(Seconds const dt) {
@@ -20,7 +23,9 @@ void EndlessScene::tick(Seconds const dt) {
 
 	if (is_game_over()) { return; }
 
-	if (auto creep = m_creeps.tick(dt)) { push_enemy(std::move(creep)); }
+	for (auto const& spawn_timer : m_spawn_timers) {
+		if (auto enemy = spawn_timer->tick(dt)) { push_enemy(std::move(enemy)); }
+	}
 }
 
 void EndlessScene::debug_spawn_powerup(glm::vec2 const position) {
diff --git a/src/spaced/spaced/scenes/endless.hpp b/src/spaced/spaced/scenes/endless.hpp
index a262866..e6a63d1 100644
--- a/src/spaced/spaced/scenes/endless.hpp
+++ b/src/spaced/spaced/scenes/endless.hpp
@@ -1,5 +1,4 @@
 #pragma once
-#include <spaced/game/enemies/creep.hpp>
 #include <spaced/scenes/game.hpp>
 #include <spaced/signal.hpp>
 
@@ -9,13 +8,19 @@ class EndlessScene : public GameScene {
 	EndlessScene(bave::App& app, bave::Services const& services);
 
   private:
+	struct ISpawnTimer : bave::Polymorphic {
+		virtual auto tick(bave::Seconds dt) -> std::unique_ptr<Enemy> = 0;
+	};
+
 	template <std::derived_from<Enemy> T>
-	struct SpawnTimer {
+	struct SpawnTimer : ISpawnTimer {
 		bave::NotNull<bave::Services const*> services;
 		bave::Seconds spawn_rate{1s};
 		bave::Seconds elapsed{};
 
-		auto tick(bave::Seconds const dt) -> std::unique_ptr<T> {
+		explicit SpawnTimer(bave::NotNull<bave::Services const*> services) : services(services) {}
+
+		auto tick(bave::Seconds const dt) -> std::unique_ptr<Enemy> final {
 			auto ret = std::unique_ptr<T>{};
 			elapsed += dt;
 			if (elapsed >= spawn_rate) {
@@ -32,6 +37,6 @@ class EndlessScene : public GameScene {
 
 	SignalHandle m_on_player_scored{};
 
-	SpawnTimer<enemy::Creep> m_creeps;
+	std::vector<std::unique_ptr<ISpawnTimer>> m_spawn_timers{};
 };
 } // namespace spaced