Add Player death foundation. (#31)

Author: karnkaul

assets/worlds/playground.json

@@ -3,7 +3,8 @@
   "background_tint": "mocha",
   "player": {
     "tint": "black",
-    "exhaust_emitter": "particles/exhaust.json"
+    "exhaust_emitter": "particles/exhaust.json",
+    "death_emitter": "particles/explode.json"
   },
   "enemy_factories": [
     {

src/spaced/spaced/game/asset_list.cpp

@@ -44,7 +44,9 @@ auto AssetList::read_world_spec(std::string_view const uri) -> WorldSpec {
 	if (auto const& player = json["player"]) {
 		ret.player.tint = player["tint"].as_string();
 		ret.player.exhaust_emitter = player["exhaust_emitter"].as_string();
+		ret.player.death_emitter = player["death_emitter"].as_string();
 		add_particle_emitter(ret.player.exhaust_emitter);
+		add_particle_emitter(ret.player.death_emitter);
 	}
 
 	for (auto const& enemy_factory : json["enemy_factories"].array_view()) {

src/spaced/spaced/game/damageable.hpp

@@ -7,5 +7,6 @@ class IDamageable : public bave::Polymorphic {
   public:
 	[[nodiscard]] virtual auto get_bounds() const -> bave::Rect<> = 0;
 	virtual auto take_damage(float damage) -> bool = 0;
+	virtual void force_death() = 0;
 };
 } // namespace spaced

src/spaced/spaced/game/enemies/creep.cpp

@@ -3,8 +3,10 @@
 namespace spaced {
 using bave::Seconds;
 
-void Creep::tick(Seconds const dt) {
-	Enemy::tick(dt);
+void Creep::tick(Seconds const dt, bool const in_play) {
+	Enemy::tick(dt, in_play);
+	if (!in_play) { return; }
+
 	shape.transform.position.x -= x_speed * dt.count();
 	if (shape.transform.position.x < -0.5f * (get_layout().get_world_space().x + shape.get_shape().size.x)) { set_destroyed(); }
 }

src/spaced/spaced/game/enemies/creep.hpp

@@ -6,7 +6,7 @@ class Creep : public Enemy {
   public:
 	explicit Creep(Services const& services, bave::NotNull<IEnemyDeathListener*> listener) : Enemy(services, listener, "Creep") {}
 
-	void tick(bave::Seconds dt) override;
+	void tick(bave::Seconds dt, bool in_play) override;
 
 	float x_speed{100.0f};
 };

src/spaced/spaced/game/enemy.cpp

@@ -16,7 +16,7 @@ Enemy::Enemy(Services const& services, bave::NotNull<IEnemyDeathListener*> liste
 	static constexpr auto init_size_v = glm::vec2{100.0f};
 	auto const play_area = m_layout->get_play_area();
 	auto const y_min = play_area.rb.y + 0.5f * init_size_v.y;
-	auto const y_max = play_area.lt.y - 0.5f * init_size_v.y;
+	auto const y_max = play_area.lt.y - 0.5f * init_size_v.y - 50.0f;
 	setup(init_size_v, random_in_range(y_min, y_max));
 
 	health_bar.set_style(services.get<Styles>().progress_bars["enemy"]);
@@ -29,7 +29,13 @@ auto Enemy::take_damage(float const damage) -> bool {
 	return true;
 }
 
-void Enemy::tick(Seconds const dt) {
+void Enemy::force_death() {
+	health = 0.0f;
+	health_bar.set_progress(0.0f);
+	m_listener->on_death(EnemyDeath{.position = shape.transform.position});
+}
+
+void Enemy::tick(Seconds const dt, bool const /*in_play*/) {
 	health_bar.position = shape.transform.position;
 	health_bar.position.y += 0.5f * shape.get_shape().size.y + 20.0f;
 	health_bar.size = {shape.get_shape().size.x, 10.0f};

src/spaced/spaced/game/enemy.hpp

@@ -16,12 +16,13 @@ class Enemy : public IDamageable, public bave::IDrawable {
 
 	[[nodiscard]] auto get_bounds() const -> bave::Rect<> override { return shape.get_bounds(); }
 	auto take_damage(float damage) -> bool override;
+	void force_death() override;
 
 	[[nodiscard]] auto is_dead() const -> bool { return health.is_dead(); }
 	[[nodiscard]] auto is_destroyed() const -> bool { return is_dead() || m_destroyed; }
 	void set_destroyed() { m_destroyed = true; }
 
-	virtual void tick(bave::Seconds dt);
+	virtual void tick(bave::Seconds dt, bool in_play);
 	void draw(bave::Shader& shader) const override;
 
 	void setup(glm::vec2 max_size, float y_position);

src/spaced/spaced/game/enemy_spawner.cpp

@@ -14,11 +14,11 @@ EnemySpawner::EnemySpawner(std::unique_ptr<IEnemyFactory> factory) : m_factory(s
 	if (!m_factory) { throw std::runtime_error{"Null EnemyFactory passed to EnemySpawner"}; }
 }
 
-void EnemySpawner::tick(Seconds const dt) {
+void EnemySpawner::tick(Seconds const dt, bool const in_play) {
 	if (m_factory->tick(dt)) { spawn(); }
 
 	for (auto const& enemy : m_enemies) {
-		enemy->tick(dt);
+		enemy->tick(dt, in_play);
 		if (enemy->is_dead()) { explode_at(enemy->get_bounds().centre()); }
 	}
 

src/spaced/spaced/game/enemy_spawner.hpp

@@ -7,7 +7,7 @@ class EnemySpawner {
   public:
 	explicit EnemySpawner(std::unique_ptr<IEnemyFactory> factory);
 
-	void tick(bave::Seconds dt);
+	void tick(bave::Seconds dt, bool in_play);
 	void draw(bave::Shader& shader) const;
 
 	void spawn() { m_enemies.push_back(m_factory->spawn_enemy()); }

src/spaced/spaced/game/player.cpp

@@ -25,9 +25,24 @@ void Player::on_move(PointerMove const& pointer_move) { m_controller->on_move(po
 void Player::on_tap(PointerTap const& pointer_tap) { m_controller->on_tap(pointer_tap); }
 
 void Player::tick(State const& state, Seconds const dt) {
+	if (m_death) {
+		m_death->tick(dt);
+		if (m_death->active_particles() == 0) { m_death.reset(); }
+	}
+
+	if (health.is_dead()) { return; }
+
 	auto const y_position = m_controller->tick(dt);
 	set_y(y_position);
 
+	for (auto const& target : state.targets) {
+		if (is_intersecting(target->get_bounds(), ship.get_bounds())) {
+			on_death();
+			target->force_death();
+			return;
+		}
+	}
+
 	auto const round_state = IWeaponRound::State{.targets = state.targets, .muzzle_position = get_muzzle_position()};
 	m_arsenal.tick(round_state, m_controller->is_firing(), dt);
 
@@ -40,18 +55,24 @@ void Player::tick(State const& state, Seconds const dt) {
 }
 
 void Player::draw(Shader& shader) const {
-	m_exhaust.draw(shader);
-	ship.draw(shader);
+	if (!health.is_dead()) {
+		m_exhaust.draw(shader);
+		ship.draw(shader);
+	}
 	m_arsenal.draw(shader);
+	if (m_death) { m_death->draw(shader); }
 }
 
 void Player::setup(WorldSpec::Player const& spec) {
 	auto const& rgbas = m_services->get<Styles>().rgbas;
 	auto const& resources = m_services->get<Resources>();
 	ship.tint = rgbas[spec.tint];
+
 	if (auto const exhaust = resources.get<ParticleEmitter>(spec.exhaust_emitter)) { m_exhaust = *exhaust; }
 	m_exhaust.set_position(get_exhaust_position());
 	m_exhaust.pre_warm();
+
+	if (auto const death = resources.get<ParticleEmitter>(spec.death_emitter)) { m_death_source = *death; }
 }
 
 void Player::set_y(float const y) { ship.transform.position.y = y; }
@@ -74,6 +95,13 @@ void Player::setup_ship() {
 	ship.set_shape(rounded_quad);
 }
 
+void Player::on_death() {
+	health = 0.0f;
+	m_death = m_death_source;
+	m_death->set_position(ship.transform.position);
+	m_death->config.respawn = false;
+}
+
 void Player::do_inspect() {
 	if constexpr (bave::imgui_v) {
 		if (ImGui::TreeNodeEx("Controller", ImGuiTreeNodeFlags_Framed | ImGuiTreeNodeFlags_DefaultOpen)) {