Track asteroid count

game.c

@@ -104,6 +104,7 @@ static shape_t shapes[MAX_SHAPES];
 
 static unsigned entity_count;
 static unsigned shape_count;
+static unsigned asteroid_count;
 
 static bool dead;
 static float aspect;
@@ -230,6 +231,8 @@ static void spawn_asteroid()
 		ASTEROID_VEL_JITTER * rng_plusminus(),
 	};
 	e->omg = ASTEROID_OMG_JITTER * rng_plusminus();
+
+	++asteroid_count;
 }
 
 static void remove_shape(unsigned id)
@@ -329,6 +332,7 @@ static void bounce(collision_t c)
 static void destroy_asteroid(entity_t *a, vec2_t shot_vel)
 {
 	a->dead = true;
+	--asteroid_count;
 
 	float r;
 	if (fabs(a->radius - ASTEROID_LARGE) < 1e-3)
@@ -363,6 +367,8 @@ static void destroy_asteroid(entity_t *a, vec2_t shot_vel)
 		e->pos = vec2_add(a->pos, disp);
 		e->vel = vec2_add(inherit_v, vec2_add(radial_v, jitter_v));
 		e->omg = a->omg / n + REPLACE_OMG_JITTER * rng_plusminus();
+
+		++asteroid_count;
 	}
 }