Add heat/cooldown mechanic (#57)

* Add heat/cooldown mechanics

* Add more health to enemies

* Cleanup.

---------

Co-authored-by: Karn Kaul <karnkaul@gmail.com>

assets/assets/styles.json

@@ -9,7 +9,8 @@
     "gun_beam": "#bc96e6ff",
     "exhaust": "#36bbf5ff",
     "bg_top": "#10020eff",
-    "bg_bottom": "#040003ff"
+    "bg_bottom": "#040003ff",
+    "ship_heat": "#ac3939ff"
   },
   "buttons": {
     "default": {
@@ -81,4 +82,4 @@
       "padding": 20
     }
   }
-}
+}

src/spaced/spaced/game/arsenal.cpp

@@ -21,11 +21,13 @@ auto Arsenal::get_weapon() -> Weapon& {
 	return const_cast<Weapon&>(std::as_const(*this).get_weapon()); // NOLINT(cppcoreguidelines-pro-type-const-cast)
 }
 
-void Arsenal::tick(IWeaponRound::State const& round_state, bool const fire, Seconds const dt) {
+auto Arsenal::tick(IWeaponRound::State const& round_state, bool const fire, Seconds const dt) -> bool {
 	tick_weapons(dt);
 	check_switch_weapon();
-	if (round_state.in_play && fire) { fire_weapon(round_state.muzzle_position); }
+	bool has_fired = false;
+	if (round_state.in_play && fire) { has_fired = fire_weapon(round_state.muzzle_position); }
 	tick_rounds(round_state, dt);
+	return has_fired;
 }
 
 void Arsenal::draw(Shader& shader) const {
@@ -53,11 +55,13 @@ void Arsenal::check_switch_weapon() {
 	}
 }
 
-void Arsenal::fire_weapon(glm::vec2 const muzzle_position) {
+auto Arsenal::fire_weapon(glm::vec2 const muzzle_position) -> bool {
 	if (auto round = get_weapon().fire(muzzle_position)) {
 		m_rounds.push_back(std::move(round));
 		++m_stats->player.shots_fired;
+		return true;
 	}
+	return false;
 }
 
 void Arsenal::tick_rounds(IWeaponRound::State const& round_state, Seconds const dt) {

src/spaced/spaced/game/arsenal.hpp

@@ -18,13 +18,14 @@ class Arsenal {
 
 	void set_special(std::unique_ptr<Weapon> weapon) { m_next = std::move(weapon); }
 
-	void tick(IWeaponRound::State const& round_state, bool fire, bave::Seconds dt);
+	// returns whether a round was fired this frame
+	auto tick(IWeaponRound::State const& round_state, bool fire, bave::Seconds dt) -> bool;
 	void draw(bave::Shader& shader) const;
 
   private:
 	void tick_weapons(bave::Seconds dt);
 	void check_switch_weapon();
-	void fire_weapon(glm::vec2 muzzle_position);
+	auto fire_weapon(glm::vec2 muzzle_position) -> bool;
 	void tick_rounds(IWeaponRound::State const& round_state, bave::Seconds dt);
 
 	bave::NotNull<Stats*> m_stats;

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

@@ -11,7 +11,7 @@ Creep::Creep(bave::Services const& services) : Enemy(services, "Creep") {
 		m_sprite.set_texture(std::move(texture));
 	}
 
-	health = 1.0f;
+	health = 2.0f;
 	speed = 100.0f;
 	points = 10;
 }

src/spaced/spaced/game/enemies/gunner.cpp

@@ -11,7 +11,7 @@ Gunner::Gunner(bave::Services const& services, bave::NotNull<GunKinetic*> gun) :
 		m_sprite.set_texture(std::move(texture));
 	}
 
-	health = 2.0f;
+	health = 3.0f;
 	speed = 120.0f;
 	points = 20;
 }

src/spaced/spaced/game/enemies/trooper.cpp

@@ -18,7 +18,7 @@ Trooper::Trooper(Services const& services, NotNull<GunKinetic*> gun) : GunnerBas
 
 	m_direction = random_in_range(0, 1) == 0 ? 1.0f : -1.0f;
 
-	health = 3.0f;
+	health = 4.0f;
 	speed = 150.0f;
 	points = 30;
 }

src/spaced/spaced/game/player.cpp

@@ -46,6 +46,8 @@ Player::Player(Services const& services, std::unique_ptr<IController> controller
 
 	if (auto const death = resources.get<ParticleEmitter>("assets/particles/explode.json")) { m_death_source = *death; }
 	m_death_source.config.respawn = false;
+
+	m_heat_color = rgbas.get_or("ship_heat", bave::red_v);
 }
 
 void Player::on_focus(bave::FocusChange const& /*focus_changed*/) { m_controller->untap(); }
@@ -65,7 +67,20 @@ void Player::tick(State const& state, Seconds const dt) {
 		.muzzle_position = get_muzzle_position(),
 		.in_play = !m_health.is_dead(),
 	};
-	m_arsenal.tick(round_state, m_controller->is_firing(), dt);
+
+	auto const has_fired = m_arsenal.tick(round_state, m_controller->is_firing() && !m_is_cooling_down, dt);
+
+	if (has_fired) {
+		m_heat += m_heat_increment;
+	} else {
+		m_heat -= (m_is_cooling_down ? m_heat_dissipated * 0.5f : m_heat_dissipated) * dt.count();
+	}
+	if (m_heat >= 1.0f) { m_is_cooling_down = true; }
+	if (m_heat <= m_cooldown_threshold) { m_is_cooling_down = false; }
+	m_heat = std::clamp(m_heat, 0.f, 1.0f);
+
+	m_heat_being_rendered = glm::mix(m_heat_being_rendered, m_heat, 0.5f);
+	ship.tint = bave::Rgba::from(glm::mix(bave::white_v.to_vec4(), m_heat_color.to_vec4(), m_heat_being_rendered));
 
 	m_shield.set_position(ship.transform.position);
 	m_shield.tick(dt);
@@ -188,6 +203,10 @@ void Player::do_inspect() {
 		}
 
 		if (ImGui::Button("1up")) { one_up(); }
+
+		ImGui::DragFloat("heat dissipated per sec", &m_heat_dissipated, 0.05f, 0.f, 1.f);
+		ImGui::DragFloat("heat per round fired", &m_heat_increment, 0.1f, 0.f, 1.f);
+		ImGui::DragFloat("cooldown threshold", &m_cooldown_threshold, 0.1f, 0.f, 0.9f);
 	}
 }
 } // namespace spaced

src/spaced/spaced/game/player.hpp

@@ -74,6 +74,14 @@ class Player : public IDamageable, public bave::IDrawable {
 	bave::ParticleEmitter m_exhaust{};
 	Shield m_shield;
 
+	float m_heat_being_rendered{};
+	float m_heat{};
+	float m_heat_increment{0.1f};
+	float m_heat_dissipated{0.4f}; // per second
+	bave::Rgba m_heat_color{};
+	bool m_is_cooling_down{};
+	float m_cooldown_threshold{0.5f};
+
 	bave::ParticleEmitter m_death_source{};
 	std::optional<bave::ParticleEmitter> m_death{};
 

src/spaced/spaced/game/weapons/gun_kinetic.cpp

@@ -38,6 +38,8 @@ void GunKinetic::do_inspect() {
 		auto tint = projectile_config.tint.to_vec4();
 		if (ImGui::ColorEdit4("projectile tint", &tint.x)) { projectile_config.tint = Rgba::from(tint); }
 		ImGui::DragFloat("damage", &projectile_config.damage, 0.25f, 0.25f, 10.0f);
+		auto reload_delay_s = reload_delay.count();
+		if (ImGui::DragFloat("reload delay", &reload_delay_s, 0.05f, 0.1f, 1.f)) { reload_delay = Seconds{reload_delay_s}; }
 	}
 }
 } // namespace spaced

src/spaced/spaced/game/weapons/gun_kinetic.hpp

@@ -15,7 +15,7 @@ class GunKinetic final : public Weapon {
 
 	Projectile::Config projectile_config{};
 	std::string_view fire_sfx{"assets/sfx/kinetic_fire.wav"};
-	bave::Seconds reload_delay{0.25s};
+	bave::Seconds reload_delay{0.15s};
 
   private:
 	auto do_fire(glm::vec2 muzzle_position) -> std::unique_ptr<Round> final;