Basic alien AI.

3 files changed, 103 insertions, 14 deletions

diff --git a/src/game/game.cpp b/src/game/game.cpp
index 71d24ac..b9a46db 100644
--- a/src/game/game.cpp
+++ b/src/game/game.cpp
@@ -16,8 +16,7 @@ void state_t::start(void)
 	units.insert(human);
 
 	alien = new alien_t;
-	alien->place(&world, v2f_t(5.5, 5.5));
-	units.insert(alien);
+	alien->place(&world, v2f_t(15.5, -2.5));
 }
 
 void state_t::stop(void)
@@ -41,6 +40,10 @@ void state_t::select(rectf_t x)
 			continue;
 
 		unit = (unit_t*)ent;
+
+		if (unit->type != unit_t::UNIT_HUMAN)
+			continue;
+
 		unit->selected = selection_cookie;
 		selected_units.insert(unit);
 	}
@@ -62,8 +65,45 @@ void state_t::tick(double now_, double dt_)
 	now = now_;
 	dt = dt_;
 
-	for (unit_t *unit : units)
-		unit->keep_moving(now, dt);
+	for (unit_t *unit : units) {
+		rectf_t wake_range;
+
+		wake_range[0] = unit->x - v2f_t(10, 10);
+		wake_range[1] = unit->x + v2f_t(10, 10);
+
+		for (world::entity_t *ent : world.get_entities(wake_range, -1)) {
+			unit_t *enemy;
+
+			if (ent->type != ET_UNIT)
+				continue;
+
+			enemy = (unit_t*)ent;
+			enemy->wake_time = now;
+
+			if (enemy->awake)
+				continue;
+
+			if (enemy->type == unit_t::UNIT_HUMAN)
+				continue;
+
+			enemy->awake = true;
+			awake_units.insert(enemy);
+			enemy->wake(now, unit);
+		}
+
+		unit->think(now, dt);
+	}
+
+	for (auto i = std::begin(awake_units); i != std::end(awake_units);) {
+		if (now - (*i)->wake_time >= 5.0) {
+			(*i)->awake = false;
+			(*i)->sleep(now);
+			i = awake_units.erase(i);
+		} else {
+			(*i)->think(now, dt);
+			i++;
+		}
+	}
 }
 
 bool load_assets(void)
diff --git a/src/game/game.hpp b/src/game/game.hpp
index f45aecf..f141e85 100644
--- a/src/game/game.hpp
+++ b/src/game/game.hpp
@@ -45,7 +45,14 @@ namespace game {
 		world::cflags_t cflags;
 		size_t selected = 0;
 
-		unit_t();
+		typedef enum {
+			UNIT_HUMAN,
+			UNIT_ALIEN
+		} type_t;
+
+		type_t type;
+
+		unit_t(type_t type_);
 
 		struct {
 			bool moving = false;
@@ -62,23 +69,39 @@ namespace game {
 		const wchar_t *say_text;
 		double say_time = -INFINITY;
 
+		bool awake = false;
+		double wake_time = -INFINITY;
+
 		void render_to(render::state_t *render);
 		void say(const wchar_t *wstr, double now);
 		void place(world::world_t *world_, v2f_t x_);
-		bool keep_moving(double now, double dt);
+		bool keep_moving(double now, double dt, double speed);
 		bool start_moving(v2f_t dst_, double now);
+
+		virtual void wake(double now, unit_t *by_whom) = 0;
+		virtual void sleep(double now) = 0;
+		virtual void think(double now, double dt) = 0;
 	};
 
 	class human_t : public unit_t {
 	public:
 		human_t();
 		void render_to(render::state_t *render);
-		bool keep_moving(double now, double dt);
+
+		void wake(double now, unit_t *by_whom);
+		void sleep(double now);
+		void think(double now, double dt);
 	};
 
 	class alien_t : public unit_t {
+		unit_t *target;
+
 	public:
 		alien_t();
 		void render_to(render::state_t *render);
+
+		void wake(double now, unit_t *by_whom);
+		void sleep(double now);
+		void think(double now, double dt);
 	};
 };
diff --git a/src/game/units.cpp b/src/game/units.cpp
index d695050..4c4e828 100644
--- a/src/game/units.cpp
+++ b/src/game/units.cpp
@@ -20,8 +20,9 @@ void unit_t::compute_bounds()
 }
 
 
-unit_t::unit_t() : entity_t(ET_UNIT)
+unit_t::unit_t(unit_t::type_t type_) : entity_t(ET_UNIT)
 {
+	type = type_;
 }
 
 void unit_t::render_to(render::state_t *render)
@@ -53,7 +54,7 @@ void unit_t::place(world::world_t *world_, v2f_t x_)
 	link(world);
 }
 
-bool unit_t::keep_moving(double now, double dt)
+bool unit_t::keep_moving(double now, double dt, double speed)
 {
 	float time;
 
@@ -63,7 +64,7 @@ bool unit_t::keep_moving(double now, double dt)
 	if (move.blocked && now < move.next_attempt)
 		return false;
 
-	time = dt * 10;
+	time = dt * speed;
 
 	while (time > 0.0f) {
 		v2f_t delta, next, x_new;
@@ -137,7 +138,7 @@ bool unit_t::start_moving(v2f_t dst_, double now)
 	return true;
 }
 
-human_t::human_t()
+human_t::human_t() : unit_t(UNIT_HUMAN)
 {
 	size[0] = v2f_t(-0.4f, -0.4f);
 	size[1] = v2f_t(+0.4f, +0.4f);
@@ -145,9 +146,17 @@ human_t::human_t()
 	render_size[1] = v2f_t(+0.5f, +0.5f);
 }
 
-bool human_t::keep_moving(double now, double dt)
+void human_t::wake(double now, unit_t *by_whom)
 {
-	unit_t::keep_moving(now, dt);
+}
+
+void human_t::sleep(double now)
+{
+}
+
+void human_t::think(double now, double dt)
+{
+	keep_moving(now, dt, 4.0);
 }
 
 void human_t::render_to(render::state_t *render)
@@ -175,7 +184,7 @@ void human_t::render_to(render::state_t *render)
 	unit_t::render_to(render);
 }
 
-alien_t::alien_t()
+alien_t::alien_t() : unit_t(UNIT_ALIEN)
 {
 	size[0] = v2f_t(-0.2f, -0.2f);
 	size[1] = v2f_t(+0.2f, +0.2f);
@@ -183,6 +192,23 @@ alien_t::alien_t()
 	render_size[1] = v2f_t(+0.3f, +0.3f);
 }
 
+void alien_t::wake(double now, unit_t *by_whom)
+{
+	target = by_whom;
+	printf("the alien is now awake\n");
+}
+
+void alien_t::sleep(double now)
+{
+	printf("the alien is now sleeping\n");
+}
+
+void alien_t::think(double now, double dt)
+{
+	start_moving(target->x, now);
+	keep_moving(now, dt, 7.0);
+}
+
 void alien_t::render_to(render::state_t *render)
 {
 	bool moving;