kettek2/wiki/games/newsboy/Newsboy_0x00/engine/EntityManager.c

#include <stdlib.h>
#include "EntityManager.h"
#include "report.h"

int initEntityManager(struct EntityManager *manager){ 
  if (manager == NULL) {
    return 1;
  }
  manager->sprites = NULL;
  manager->animations = NULL;
  manager->entities = NULL;
  manager->live_entities = NULL;
  manager->live_count = 0;
  initIndex(&manager->index, 0);
  return 0;
}

int setEntityAnimation(struct EntityManager *manager, int entity_id, char *name) {
  if (manager == NULL) {
    return 1;
  }
  if (entity_id < 0) {
    return 2;
  }
  if (entity_id > manager->live_count) {
    return 3;
  }
  if (name == NULL) {
    return 4;
  }
  struct Entity *entity = getEntity(manager, entity_id);
  if (entity == NULL) {
    return 5;
  }
  int anim_id = getResourceId(manager->animations, name);
  if (anim_id < 0) {
    return 6;
  }
  entity->anim.anim_id = anim_id;
  return 0;
}

int setEntitySet(struct EntityManager *manager, int entity_id, char *name) {
  if (manager == NULL) {
    return 1;
  }
  if (entity_id < 0) {
    return 2;
  }
  if (entity_id > manager->live_count) {
    return 3;
  }
  if (name == NULL) {
    return 4;
  }
  struct Entity *entity = getEntity(manager, entity_id);
  if (entity == NULL) {
    return 5;
  }
  struct Resources *anim_data = getResourceById(manager->animations, entity->anim.anim_id);
  if (anim_data == NULL) {
    return 6;
  }
  int set_id = getResourceId(anim_data, name);
  if (set_id < 0) {
    return 7;
  }
  entity->anim.set_id = set_id;
  return 0;
}

int setEntityFace(struct EntityManager *manager, int entity_id, char *name) {
  if (manager == NULL) {
    return 1;
  }
  if (entity_id < 0) {
    return 2;
  }
  if (entity_id > manager->live_count) {
    return 3;
  }
  if (name == NULL) {
    return 4;
  }
  struct Entity *entity = getEntity(manager, entity_id);
  if (entity == NULL) {
    return 5;
  }
  struct Resources *anim_data = getResourceById(manager->animations, entity->anim.anim_id);
  if (anim_data == NULL) {
    return 6;
  }
  struct Resources *set_data = getResourceById(anim_data, entity->anim.set_id);
  if (set_data == NULL) {
    return 6;
  }
  int face_id = getResourceId(set_data, name);
  //printf("set to %d!!!!", face_id);
  entity->anim.face_id = face_id;
  return 0;
}

int growEntityManager(struct EntityManager *manager, int amount) {
  if (manager == NULL) {
    report(WARNING, "growEntityManager", "passed manager is NULL");
    return 1;
  }
  if (amount <= 0) {
    report(WARNING, "growEntityManager", "grow amount %d is invalid", amount);
    return 2;
  }
  int start = manager->index.size;
  if (growIndex(&manager->index, amount) != 0) {
    report(ERROR, "growEntityManager", "could not grow Index by %d", amount);
    return 3;
  }
  if ((manager->live_entities = realloc(manager->live_entities, manager->index.size+amount*sizeof(struct Entity*))) == NULL) {
    report(ERROR, "growEntityManager", "could not resize live_entities by %d", amount);
    return 4;
  }
  int i = start;
  while (i < manager->index.size) {
    manager->live_entities[i] = NULL;
    i++;
  }
  return 0;
}

int addEntity(struct EntityManager *manager, struct Entity *entity) {
  if (manager == NULL) {
    report(ERROR, "addEntity", "passed EntityManager is NULL");
    return -1;
  }
  if (entity == NULL) {
    report(ERROR, "addEntity", "passed Entity is NULL");
    return -2;
  }
  int id;
  if ((id = acquireIndex(&manager->index)) < 0) {
    growEntityManager(manager, 8); // grow by 8, I guess. more efficient than 1 in terms of realloc
    if ((id = acquireIndex(&manager->index)) < 0) {
      report(ERROR, "addEntity", "could not acquireIndex after growEntityManager, bailing");
      return -3;
    }
  }
  manager->live_entities[id] = entity;
  addIndex(&manager->index, id);
  manager->live_count++;
  return id;
}

int remEntity(struct EntityManager *manager, int id) {
  if (manager == NULL) {
    report(ERROR, "remEntity", "passed manager is NULL");
    return 1;
  }
  if (id < 0 || id > manager->live_count) {
    report(WARNING, "remEntity", "passed id is out of bounds");
    return 2;
  }
  if (remIndex(&manager->index, id) != 0) {
    report(WARNING, "remEntity", "%d could not be removed from Index", id);
    return 3;
  }
  manager->live_entities[id] = NULL; // since remEntity is self-managed, we don't free.
  manager->live_count--;
  return 0;
}

struct Entity *getEntity(struct EntityManager *manager, int entity_id) {
  if (manager == NULL ) {
    report(ERROR, "getEntity", "passed manager is NULL");
    return NULL;
  }
  if (entity_id < 0) {
    report(ERROR, "getEntity", "entity_id %d out of range", entity_id);
    return NULL;
  }
  if (entity_id > manager->index.size) {
    report(ERROR, "getEntity", "entity_id %d is beyond %d", entity_id, manager->index.size);
    return NULL;
  }
  return manager->live_entities[entity_id];
}