From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 27 Nov 2022 21:49:23 +0000 (+0200)
Subject: Make asteroids take damage when shot and eventually be destroyed
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgame.git;a=commitdiff_plain;h=cb4e8bbe06dc64aff932784541a29493723fc03e

Make asteroids take damage when shot and eventually be destroyed
---

diff --git a/examples/bassteroids/source/asteroid.cpp b/examples/bassteroids/source/asteroid.cpp
index 7e5bcd5..cb7f954 100644
--- a/examples/bassteroids/source/asteroid.cpp
+++ b/examples/bassteroids/source/asteroid.cpp
@@ -3,7 +3,7 @@
 using namespace Msp;
 
 Asteroid::Asteroid(Game::Handle<Entity> p, const AsteroidSetup &s):
-	PhysicalEntity(p, s.physical),
+	Hittable(p, s.hittable, s.physical),
 	setup(s),
 	mesh(*this, setup.mesh)
 { }
diff --git a/examples/bassteroids/source/asteroid.h b/examples/bassteroids/source/asteroid.h
index dcb64c3..b80cc65 100644
--- a/examples/bassteroids/source/asteroid.h
+++ b/examples/bassteroids/source/asteroid.h
@@ -3,15 +3,16 @@
 
 #include <msp/game/entity.h>
 #include <msp/game/meshsource.h>
-#include "physicalentity.h"
+#include "hittable.h"
 
 struct AsteroidSetup
 {
 	PhysicalSetup physical;
+	HittableSetup hittable;
 	Msp::Game::MeshSourceSetup mesh;
 };
 
-class Asteroid: public PhysicalEntity
+class Asteroid: public Hittable
 {
 public:
 	using Setup = AsteroidSetup;
diff --git a/examples/bassteroids/source/bassteroids.cpp b/examples/bassteroids/source/bassteroids.cpp
index 317b694..d6f2556 100644
--- a/examples/bassteroids/source/bassteroids.cpp
+++ b/examples/bassteroids/source/bassteroids.cpp
@@ -4,6 +4,7 @@
 #include <msp/game/transform.h>
 #include <msp/game/transformpropagator.h>
 #include "controls.h"
+#include "damagedealer.h"
 #include "gamecontroller.h"
 #include "physics.h"
 #include "playercontroller.h"
@@ -21,6 +22,7 @@ Bassteroids::Bassteroids(int, char **):
 {
 	game_stage.add_system<GameController>();
 	game_stage.add_system<Physics>();
+	game_stage.add_system<DamageDealer>();
 	game_stage.add_system<Game::TransformPropagator>();
 	player_controller = &game_stage.add_system<PlayerController>();
 
diff --git a/examples/bassteroids/source/bullet.cpp b/examples/bassteroids/source/bullet.cpp
index 957a039..e26b408 100644
--- a/examples/bassteroids/source/bullet.cpp
+++ b/examples/bassteroids/source/bullet.cpp
@@ -3,6 +3,6 @@
 using namespace Msp;
 
 Bullet::Bullet(Game::Handle<Game::Entity> p, const Setup &s, const Game::TransformValues &tv):
-	PhysicalEntity(p, s.physical, tv),
+	Hittable(p, s.hittable, s.physical, tv),
 	mesh(*this, s.mesh)
 { }
diff --git a/examples/bassteroids/source/bullet.h b/examples/bassteroids/source/bullet.h
index 44c9d80..de0804a 100644
--- a/examples/bassteroids/source/bullet.h
+++ b/examples/bassteroids/source/bullet.h
@@ -2,15 +2,16 @@
 #define BULLET_H_
 
 #include <msp/game/meshsource.h>
-#include "physicalentity.h"
+#include "hittable.h"
 
 struct BulletSetup
 {
 	PhysicalSetup physical;
+	HittableSetup hittable;
 	Msp::Game::MeshSourceSetup mesh;
 };
 
-class Bullet: public PhysicalEntity
+class Bullet: public Hittable
 {
 private:
 	Msp::Game::Owned<Msp::Game::MeshSource> mesh;
diff --git a/examples/bassteroids/source/damagedealer.cpp b/examples/bassteroids/source/damagedealer.cpp
new file mode 100644
index 0000000..37be786
--- /dev/null
+++ b/examples/bassteroids/source/damagedealer.cpp
@@ -0,0 +1,37 @@
+#include "damagedealer.h"
+#include <msp/game/stage.h>
+#include "collider.h"
+#include "hittable.h"
+
+using namespace Msp;
+
+DamageDealer::DamageDealer(Game::Stage &s):
+	System(s),
+	observer(stage.get_event_bus())
+{
+	observer.observe<Events::Collision>([this](auto &e){ collision(e); });
+}
+
+void DamageDealer::tick(Time::TimeDelta)
+{
+	for(DamagingCollision &c: collisions)
+	{
+		Game::Handle<HitPoints> hits1 = c.entity1->get_hitpoints();
+		Game::Handle<DamageSource> damage1 = c.entity1->get_damage();
+		Game::Handle<HitPoints> hits2 = c.entity2->get_hitpoints();
+		Game::Handle<DamageSource> damage2 = c.entity2->get_damage();
+		if(damage1 && hits2)
+			hits2->take_damage(damage1->get_amount(), damage1->get_type());
+		if(damage2 && hits1)
+			hits1->take_damage(damage2->get_amount(), damage2->get_type());
+	}
+	collisions.clear();
+}
+
+void DamageDealer::collision(const Events::Collision &e)
+{
+	Game::Handle<Hittable> hittable1 = dynamic_handle_cast<Hittable>(e.collider1->get_entity());
+	Game::Handle<Hittable> hittable2 = dynamic_handle_cast<Hittable>(e.collider2->get_entity());
+	if(hittable1 && hittable2)
+		collisions.emplace_back(hittable1, hittable2);
+}
diff --git a/examples/bassteroids/source/damagedealer.h b/examples/bassteroids/source/damagedealer.h
new file mode 100644
index 0000000..fe171de
--- /dev/null
+++ b/examples/bassteroids/source/damagedealer.h
@@ -0,0 +1,33 @@
+#ifndef DAMAGEDEALER_H_
+#define DAMAGEDEALER_H_
+
+#include <msp/game/eventobserver.h>
+#include <msp/game/handle.h>
+#include <msp/game/system.h>
+#include "events.h"
+
+class Collider;
+class Hittable;
+
+class DamageDealer: public Msp::Game::System
+{
+private:
+	struct DamagingCollision
+	{
+		Msp::Game::Handle<Hittable> entity1;
+		Msp::Game::Handle<Hittable> entity2;
+	};
+
+	Msp::Game::EventObserver observer;
+	std::vector<DamagingCollision> collisions;
+
+public:
+	DamageDealer(Msp::Game::Stage &);
+
+	void tick(Msp::Time::TimeDelta) override;
+
+private:
+	void collision(const Events::Collision &);
+};
+
+#endif
diff --git a/examples/bassteroids/source/damagesource.cpp b/examples/bassteroids/source/damagesource.cpp
new file mode 100644
index 0000000..a513879
--- /dev/null
+++ b/examples/bassteroids/source/damagesource.cpp
@@ -0,0 +1,8 @@
+#include "damagesource.h"
+
+using namespace Msp;
+
+DamageSource::DamageSource(Game::Handle<Game::Entity> p, const Setup &s):
+	Component(p),
+	setup(s)
+{ }
diff --git a/examples/bassteroids/source/damagesource.h b/examples/bassteroids/source/damagesource.h
new file mode 100644
index 0000000..41a2755
--- /dev/null
+++ b/examples/bassteroids/source/damagesource.h
@@ -0,0 +1,27 @@
+#ifndef DAMAGESOURCE_H_
+#define DAMAGESOURCE_H_
+
+#include <msp/game/component.h>
+
+struct DamageSourceSetup
+{
+	unsigned amount = 1;
+	unsigned type = 0;
+};
+
+class DamageSource: public Msp::Game::Component
+{
+public:
+	using Setup = DamageSourceSetup;
+
+private:
+	const Setup &setup;
+
+public:
+	DamageSource(Msp::Game::Handle<Msp::Game::Entity>, const Setup &);
+
+	unsigned get_amount() const { return setup.amount; }
+	unsigned get_type() const { return setup.type; }
+};
+
+#endif
diff --git a/examples/bassteroids/source/gamecontroller.cpp b/examples/bassteroids/source/gamecontroller.cpp
index b564033..97701e3 100644
--- a/examples/bassteroids/source/gamecontroller.cpp
+++ b/examples/bassteroids/source/gamecontroller.cpp
@@ -9,6 +9,7 @@ using namespace Msp;
 GameController::GameController(Game::Stage &s):
 	System(s),
 	asteroid_setup{ .physical={ .body={ .mass=200, .moment_of_inertia=2160 }, .collider={ .type=ColliderType::CIRCLE, .radius=3.0f } },
+		.hittable={ .damaging=true, .hits={ .max_hits=3, .vulnerable_to=1 }, .damage={ .amount=10, .type=1 }},
 		.mesh={ .object_name="Asteroid 1.object" }}
 { }
 
@@ -37,3 +38,9 @@ void GameController::tick(Time::TimeDelta)
 		throw logic_error("Unimplemented state");
 	}
 }
+
+void GameController::deferred_tick()
+{
+	System::deferred_tick();
+	erase_if(asteroids, [](Game::Handle<Asteroid> a){ return !a->get_hitpoints()->is_alive(); });
+}
diff --git a/examples/bassteroids/source/gamecontroller.h b/examples/bassteroids/source/gamecontroller.h
index 1f0d3cf..1215444 100644
--- a/examples/bassteroids/source/gamecontroller.h
+++ b/examples/bassteroids/source/gamecontroller.h
@@ -24,6 +24,7 @@ public:
 	GameController(Msp::Game::Stage &);
 
 	void tick(Msp::Time::TimeDelta) override;
+	void deferred_tick() override;
 };
 
 #endif
diff --git a/examples/bassteroids/source/hitpoints.cpp b/examples/bassteroids/source/hitpoints.cpp
new file mode 100644
index 0000000..ccd0441
--- /dev/null
+++ b/examples/bassteroids/source/hitpoints.cpp
@@ -0,0 +1,17 @@
+#include "hitpoints.h"
+
+using namespace Msp;
+
+HitPoints::HitPoints(Game::Handle<Game::Entity> e, const Setup &s):
+	Component(e),
+	setup(s),
+	remaining_hits(setup.max_hits)
+{ }
+
+void HitPoints::take_damage(unsigned amount, unsigned type)
+{
+	if(!(setup.vulnerable_to&(1<<type)))
+		return;
+
+	remaining_hits = (amount<remaining_hits ? remaining_hits-amount : 0);
+}
diff --git a/examples/bassteroids/source/hitpoints.h b/examples/bassteroids/source/hitpoints.h
new file mode 100644
index 0000000..a11d961
--- /dev/null
+++ b/examples/bassteroids/source/hitpoints.h
@@ -0,0 +1,33 @@
+#ifndef HITPOINTS_H_
+#define HITPOINTS_H_
+
+#include <msp/game/component.h>
+
+struct HitPointsSetup
+{
+	/*class Loader: public Msp::DataFile::ObjectLoader<HitPointsSetup>
+	{
+	};*/
+
+	unsigned max_hits = 1;
+	unsigned vulnerable_to = ~0U;
+};
+
+class HitPoints: public Msp::Game::Component
+{
+public:
+	using Setup = HitPointsSetup;
+
+private:
+	const Setup &setup;
+	unsigned remaining_hits;
+
+public:
+	HitPoints(Msp::Game::Handle<Msp::Game::Entity>, const Setup &);
+
+	void take_damage(unsigned, unsigned);
+
+	bool is_alive() const { return remaining_hits; }
+};
+
+#endif
diff --git a/examples/bassteroids/source/hittable.cpp b/examples/bassteroids/source/hittable.cpp
new file mode 100644
index 0000000..08355f1
--- /dev/null
+++ b/examples/bassteroids/source/hittable.cpp
@@ -0,0 +1,12 @@
+#include "hittable.h"
+
+using namespace Msp;
+
+Hittable::Hittable(Game::Handle<Game::Entity> p, const Setup &setup, const PhysicalSetup &ps, const Game::TransformValues &tv):
+	PhysicalEntity(p, ps, tv)
+{
+	if(!setup.immortal)
+		hits = Game::Owned<HitPoints>(*this, setup.hits);
+	if(setup.damaging)
+		damage = Game::Owned<DamageSource>(*this, setup.damage);
+}
diff --git a/examples/bassteroids/source/hittable.h b/examples/bassteroids/source/hittable.h
new file mode 100644
index 0000000..b548a38
--- /dev/null
+++ b/examples/bassteroids/source/hittable.h
@@ -0,0 +1,34 @@
+#ifndef HITTABLE_H_
+#define HITTABLE_H_
+
+#include <msp/game/entity.h>
+#include "damagesource.h"
+#include "hitpoints.h"
+#include "physicalentity.h"
+
+struct HittableSetup
+{
+	bool immortal = false;
+	bool damaging = false;
+	HitPointsSetup hits;
+	DamageSourceSetup damage;
+};
+
+class Hittable: public PhysicalEntity
+{
+public:
+	using Setup = HittableSetup;
+
+private:
+	Msp::Game::Owned<HitPoints> hits;
+	Msp::Game::Owned<DamageSource> damage;
+
+public:
+	Hittable(Msp::Game::Handle<Msp::Game::Entity>, const Setup &, const PhysicalSetup &,
+		const Msp::Game::TransformValues & = Msp::Game::TransformValues());
+
+	Msp::Game::Handle<HitPoints> get_hitpoints() { return hits; }
+	Msp::Game::Handle<DamageSource> get_damage() { return damage; }
+};
+
+#endif
diff --git a/examples/bassteroids/source/playercontroller.cpp b/examples/bassteroids/source/playercontroller.cpp
index 066b5f2..46f9c1f 100644
--- a/examples/bassteroids/source/playercontroller.cpp
+++ b/examples/bassteroids/source/playercontroller.cpp
@@ -12,6 +12,7 @@ PlayerController::PlayerController(Game::Stage &s):
 		.mesh={ .object_name="Bass guitar.object" },
 		.speed=12.0f, .turn_rate=4.71f },
 	bullet_setup{ .physical={ .body={ .mass=0.05f, .moment_of_inertia=0.04f }, .collider={ .type=ColliderType::CIRCLE, .radius=0.2f }},
+		.hittable={ .damaging=true, .hits={ .max_hits=1 }, .damage={ .amount=1, .type=0 }},
 		.mesh={ .object_name="Quaver.object" }}
 { }
 
@@ -55,6 +56,12 @@ void PlayerController::tick(Time::TimeDelta dt)
 	controls->reset_edges();
 }
 
+void PlayerController::deferred_tick()
+{
+	System::deferred_tick();
+	erase_if(bullets, [](Game::Handle<Bullet> b){ return !b->get_hitpoints()->is_alive(); });
+}
+
 void PlayerController::fire()
 {
 	Game::Handle<Game::Transform> player_tf = player_ship->get_transform();
diff --git a/examples/bassteroids/source/playercontroller.h b/examples/bassteroids/source/playercontroller.h
index d29b2d6..a4e35d4 100644
--- a/examples/bassteroids/source/playercontroller.h
+++ b/examples/bassteroids/source/playercontroller.h
@@ -24,6 +24,7 @@ public:
 	void set_controls(Controls *);
 
 	void tick(Msp::Time::TimeDelta) override;
+	void deferred_tick() override;
 private:
 	void fire();
 };