Bullets now expire

bullet.c

@@ -18,6 +18,7 @@ Entity *spawn_bullet(Vector2 spawn_at) {
   Entity *e = malloc(sizeof(Entity));
   e->name = "Bullet";
   e->properties = malloc(sizeof(Entity));
+  e->timer = 0.5;
   BulletProperties *props = (BulletProperties*)e->properties;
   props->position.x = spawn_at.x;
   props->position.y = spawn_at.y;
@@ -38,6 +39,7 @@ void draw_bullet(Entity *e) {
 
 void tick_bullet(Entity *e, float dt) {
   BulletProperties *props = e->properties;
+  e->timer -= dt;
   props->position.y += props->velocity.y;
 }
 

enemy.c

@@ -18,6 +18,7 @@ Entity *spawn_enemy(void) {
   Entity *e = malloc(sizeof(Entity));
   e->name = "Enemy";
   e->properties = malloc(sizeof(Entity));
+  e->timer = 1.0;
   EnemyProperties *props = (EnemyProperties*)e->properties;
   props->position.x = 400;
   props->position.y = 50;

entity.c

@@ -0,0 +1,15 @@
+//    Copyright 2025 Bill Rossi
+//    
+//    This file is part of Starship Futuretime
+//
+//    Starship Futuretime is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+//
+//    Starship Futuretime is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+//
+//    You should have received a copy of the GNU General Public License along with Starship Futuretime. If not, see <https://www.gnu.org/licenses/>. 
+
+#include "entity.h"
+
+bool entity_expired(Entity *e) {
+  return e->timer < 0;
+}

entity.h

@@ -11,12 +11,16 @@
 #ifndef ENTITY_H
 #define ENTITY_H
 
+#include <stdbool.h>
+#include <stddef.h>
+
 typedef struct Entity Entity;
 typedef struct Entities Entities;
 
 struct Entity {
   char *name;
   void *properties;
+  float timer;
   void (*draw)(Entity *e);
   void (*tick)(Entity *e, float dt);
   void (*free)(Entity *e);
@@ -28,4 +32,6 @@ struct Entities {
   size_t capacity;
 };
 
+bool entity_expired(Entity *e);
+
 #endif

game.c

@@ -8,6 +8,7 @@
 //
 //    You should have received a copy of the GNU General Public License along with Starship Futuretime. If not, see <https://www.gnu.org/licenses/>. 
 #include <stdlib.h>
+#include <stdio.h>
 #include <stdbool.h>
 #include <raylib.h>
 
@@ -42,6 +43,20 @@ void add_entity(Entities *entities, Entity *e) {
   entities->entities[entities->count++] = e;
 }
 
+void remove_entity(Entities *entities, Entity *e) {
+  size_t i;
+  for (i = 0; entities->entities[i] != e; i++) {
+    if (i > entities->count) {
+      printf("Couldn't find entity %s\n", e->name);
+      return;
+    }
+  }
+  for (; i < entities->count - 1; i++) {
+    entities->entities[i] = entities->entities[i + 1];
+  }
+  entities->count--;
+}
+
 void handle_input(Game *g) {
   handle_player_input(g->player);
   if (IsKeyPressed(KEY_S)) {
@@ -57,11 +72,19 @@ void run_frame(Game *g) {
   move_player(g->player);
   FOREACH_ENEMY {
     INIT_ENEMY;
+    if (entity_expired(e)) {
+      remove_entity(g->enemies, e);
+      continue;
+    }
     e->tick(e, GetFrameTime());
   }
 
   FOREACH_BULLET {
     INIT_BULLET;
+    if (entity_expired(e)) {
+      remove_entity(g->bullets, e);
+      continue;
+    }
     e->tick(e, GetFrameTime());
   }
 }