ecs.cc

struct Entity {
  uint32_t id;
};

struct Position {
  float x;
  float y;
};

struct Physics {
  vector3 velocity;
};

struct EntityPosition {
  uint32_t entity_id;
  Position pos;
}

struct EntityPhysics {
  uint32_t entity_id;
  Physics phys;
};

List<Entity>         entities;
List<EntityPosition> entity_positions;
List<EntityPhysis>   entity_physics;

void physics_system() {
  for (entity_phys_info : entity_physics) {
    // Get related information (position information)
    entity_pos_info = entity_positions.find(entity_phys_info.entity_id);

    // Physics time
    Position old_pos = entity_pos_info.pos;
    new_pos = physics_calculations(old_pos, entity_phys_info.velocity);

    // Set changes
    entity_pos_info.pos = new_pos;
  }
}

void main() {
  // Main loop
  for (;;) {
    physics_system();
  }
}